Buyer's guides, market data, and unfiltered opinions from our team and a rotating cast of professional operators. New essays roughly every other week.
A field guide for buyers — six rules of thumb that separate disciplined operators from gamblers, plus the exact pre-bid checklist we use ourselves.
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The single most expensive mistake we see new resellers make is bidding from the gut. It feels efficient — you scan the photos, you have a hunch, you fire off a number. But every dollar you put into a guess you can't justify is a dollar that compounds into the wrong inventory, the wrong shelf, and the wrong cash position three months later.
Confident bidding isn't about being aggressive. It's about being right enough, often enough, that the math works in your favor over hundreds of plays. Here are the six rules we use ourselves.
Decide what an item is worth to you before you look at the current bid. The current bid is anchoring information. The fair value is independent of it. Write down your max — on paper, in a sticky note, in ScanBids' bid suggestions panel — and don't move it during the auction.
The “last sold” price you see online is almost certainly the high end of a noisy distribution. Bid as if you'll list at the median, not the headline. If the median still works after fees and shipping, the trade is real.
Marketplace fees, processing fees, shipping, insurance, returns reserve. Our rule: model 18%–22% as a baseline, then add another 2% for the surprises. If a deal only works at 12% fees, it's not a deal.
Money tied up in inventory is money you can't redeploy. A 30% margin in 14 days is usually better than a 50% margin in 90 days — because in 90 days you could have done six other flips. Profit-per-day matters more than profit-per-flip.
A single $4,200 sale is a data point. Twelve $3,800-$4,300 sales is a market. The narrower the band, the more confident you can be. If you can only find one or two comps, drop your max bid by 15-20% to compensate for the unknown.
The best bidders we've watched lose more auctions than they win. They walk away the second the price crosses their pre-set ceiling — without exception. The discipline isn't winning every auction; it's winning the right ones.
That last one is the most important. If you can't articulate the risk, you're not modeling the trade — you're hoping. Hope is not a strategy.
None of this is rocket science. It's just slow, deliberate, repeatable discipline. Tools like ScanBids exist to remove the friction from this checklist — to turn five minutes of comp research into five seconds — so you can spend your energy on the only thing that actually matters: deciding whether the trade is real.
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