Just a friendly suggestion.
If you have a suggestion, please let me know. What would you do right now?
This would restore everyone to a situation that would apply if the new person had not bid, or if you had rejected his bid.
I don't think it would be fair to you to be forced to sell to TMAN at 0.005 because there was a lot of time left, and someone else may have outbid him.
Unless you are very confident you will receive additional bids, I would generally not accept bids without a deposit that increase the price as much as it did. An exception may be if you believe the person to be trustworthy enough to honor their bid, and have a good reason to do so. I think you accepting these kinds of bids without a deposit is going to result in you being harmed one way or another.
In the real world I ran an auction house. True standards unless otherwise stated at the beginning of the auction, the right move is to sell to TMAN.
My actual advice would be in the future if you are not going to take a deposit from new bidders, put terms in the auction that specify what actions will be taken if this occurs again. Be it sell to runner up or re-open the bidding.....