Attention: This "problem" could be a fabulous opportunity. similar to the "secure" on the http, the guardian company would insure compliance, by verifying ownership of object being offered, insuring &/or retaining object until it is sold and shipping it to winning bidder. I'm thinking that the insurance fee would be paid by seller. I actuality, the buyer pays as the insurance, like shipping, is overhead, factored into the price the buyer pays.

Focus on finding solutions. If some very ambitious person decides to put my idea into practice, I will exchange my markrting skills for 5%. After all every successful business is 80% WORK including "skull sweat" plus financing. The finance part could be provided by the shippers and insurers who would profit from new business. in the case of cars, the auction site could easily prove their apparent integrity by allowing an escrow company tohold the title, with instruction to deliver the title and keys to the new owner. The auction site would be responsible for storage fee, or the dealer could hold the car, truck, RV etc.

Requiring a photo of each bidder could eliminate unpaid bids, as the bidders themselves could "see" their competition. Photo of winner with prize delivered could be posted. Major Las Vegas casinos post their big winners, with photo, to encourage other gamblers. Bidding photo might be of pet or whatever, for privacy. Photo of winner with pet at delivery might help. Even at a local auction, I've had another haul off thebox of books I bought.