Which channels produced registered bidders who bought?

An auction campaign has everything attribution usually lacks: a defined start, a hard deadline, a published result and a named buyer. Compared with a private-treaty sale that drifts for months, it is close to a controlled experiment.

What is missing is the join. The marketing team reports registrations and viewings, the auction room reports sold lots and hammer prices, and the two lists are never put side by side.

Because the cycle is measured in weeks, this is one of the few segments where a channel change can be tested and read within a single campaign. That makes the reconciliation worth running after every sale rather than every quarter.

Registering to bid costs a prospective buyer nothing but a form, so registration counts respond to any campaign that generates curiosity. The ratio of registrations to successful buyers is severe, and it varies enormously by channel.

Ranking channels on sold lots and commission strips out the curiosity. A channel producing half the registrations and twice the buyers is the one worth funding, and it is invisible on any report built from the top of the funnel.

An auction house lives or dies on instructions. Without lots there is no sale, and the marketing that wins lots is aimed at an entirely different audience from the marketing that fills the room. Receivers and insolvency practitioners, asset managers at lenders, executors and probate solicitors, local agents with stock that failed to sell by private treaty, landlords liquidating a portfolio, councils disposing of surplus property. Each of those is a relationship cultivated over years through calls, lunches, market reports, appraisal work and the occasional sponsorship of something nobody would describe as advertising.

None of that appears in an advertising platform and none of it is measured against anything at all. The marketing budget is discussed in meetings as though it were entirely a question of bidders, because bidders are the visible half, the half that produces a spike in web traffic a fortnight before a sale, and the half a portal will send a report about. The vendor side is treated as business development rather than marketing, which is how it escapes scrutiny in both directions: nobody defends its cost and nobody credits its return.

The vendors and introducers are simply a list of names with contact details, so they upload as a source file exactly as a campaign does, with no change to how anybody works. Lots entered by each introducing source, and the commission and fees those lots earned, are then ranked on the same table as the bidder-facing spend, over whatever period the firm chooses. Auction houses running that comparison for the first time typically find that two or three vendor relationships account for a strikingly disproportionate share of the year's earnings.

Somebody who bid to within one increment of the hammer and lost has proved more than any enquiry form ever could. They have the finance arranged, they have read the legal pack, they have almost certainly been to the property, and they wanted it enough to keep their hand up to a serious number in front of a room. The next catalogue is the single most valuable piece of marketing that person will ever be sent, and the cost of sending it to them is effectively nothing beyond the postage.

Most auction houses do contact underbidders, informally, when a similar lot appears in the next catalogue. A member of staff remembers, or scrolls back through the bidding record, and makes a call. What almost none of them do is treat that list as a channel with a measurable return, sitting in the same table as the portal spend, the property press advertising and the direct mail. It is regarded as good practice rather than as a line in the budget, which means it is never resourced properly and never defended when costs are cut.

Exporting the underbidder list from each sale and uploading it as a source file changes that in one step. A buyer at the October sale who had been an underbidder in June is credited to the June sale's list rather than to whichever portal listing they happened to click most recently, because the match is on the person and the interval does not matter. The value of maintaining and working that list then becomes a figure instead of a habit, and in a business where budgets are set per catalogue, a channel that costs almost nothing and converts unusually well is worth proving.

What an auction house earns on a lot is rarely a simple percentage of anything. There is commission from the vendor, a buyer's premium, sometimes an entry or catalogue fee payable whether or not the lot sells, administration charges, and occasionally a share of the legal pack cost. The proportions differ considerably between vendor types, and a receiver's terms are not a private seller's terms. The hammer price, meanwhile, is the number everybody quotes, the one that appears in the published results and the one that gets repeated in the office afterwards.

Ranking channels on hammer price therefore ranks them on the value of the property rather than on what the sale actually earned the firm. A source that produced one expensive lot on thin terms can outrank a source that produced six modest lots at full commission plus premium and entry fees, and nothing in the published results table would ever reveal it. The gap is not small, because it is exactly the gap between the market's opinion of a property and the firm's own revenue from selling it.

Exporting fee income per sold lot, with a lot-type column beside it, corrects the ordering and costs one extra field in a report the accounts office already produces. It also makes the channel table reconcile to the firm's own revenue, which matters a great deal in a business where a single sale day generates most of a month's income. The finance director is watching the fee line rather than the totals printed in the catalogue results, and a marketing report that speaks in the same units is one that gets read.