Edit: Just saw Klaora's post below me, and that would pretty much fix the whole issue lmao. If anything's added for this, that would be the easiest fix, really.

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I don't have an opinion either way, but perhaps possible abuse could be avoided by using a limited period of being able to reverse the bid? For example, the limit would be 2-5 minutes after you bid, and once that timer's up, you have to keep that bid in place. That way if someone bid by mistake, they could fix it as soon as they do it. And there could be a limit put in place to how many times you could take back a bid, as the original poster said - maybe 1 time daily, or once per auction. Just something to stop someone from doing it on purpose.

And if the bid was removed, it wouldn't change anything for the previous bidder - it could add their PC back onto the auction, possibly with a message to let them know what happened. The short limit to reverse a bid could help with the whole 'previous bidder moving on to another auction' thing as well, since it would be such a short time frame. And it could remove a snipe guard activation if necessary, as the mistaken bid wouldn't count once removed.

I don't know, just was bored wanted to add my two cents here.