The items that quietly lose money are rarely the ones with an obvious, priced-in fault — they're the ones where a repair turns out to cost more, or take longer, than assumed in the moment of buying. A short pre-purchase check reduces how often that happens.
Before you buy: a three-question check
- What is the specific fault — named precisely, not "doesn't seem to work right"? A vague fault description at purchase time almost always turns into a vague, harder-to-budget repair later.
- Is the needed part or fix something you can identify by name right now (a specific part, a specific service), or would identifying it require further diagnosis you haven't done yet?
- If diagnosis is still needed, what's the worst plausible outcome — and are you still willing to buy at this price if that's what it turns out to be?
Budgeting the repair cost into your offer
Repair budget as part of the purchase decision
estimatedRepairBudget = (known part/service cost) + (diagnosis-uncertainty buffer)
Example (illustrative): A washer with a suspected pump issue: the part itself typically runs a knowable range, so budget the higher end of that range as the known cost, then add a buffer for the chance the actual fault is something else entirely. Feed that total into the repair/prep-cost line of the maximum-purchase-price formula, not treated as a separate afterthought.
When to walk away instead of budgeting a guess
If the needed part is genuinely unknown, the seller can't answer basic questions about the fault, and the item can't be tested on the spot, that's a signal to pass rather than to buy and hope — not because the item definitely isn't worth it, but because pricing an unknown accurately isn't possible, and a wrong guess is a direct loss.