+1, the auction insta should be announced from the start like: This auction lasts 72 hours. In 48 hours after the first bid, the insta will be announced. You just give your money to a friend if you're not in the same timezone and he gets the insta for you if needed. Everyone will have the same chance to win it.
My issue is that with most of these really high auctions, they suddenly pull an insta after having had some big bids, and a random dude comes 10 seconds later and gets the insta, without anyone else having any time to react, while the other bidders have paid attention nonstop, and due to being screwed by timezones sometimes, they can't do anything about it. It sometimes feels stupid to bid on something when most of the time it feels like the guy who runs the auction secretly sets an insta with someone in DMs so he can post first the insta in forums and then the dude comes and takes it. (I'm wording it like that because he can't say "sold insta" before announcing the insta and someone bidding afterwards. It's not allowed).