Honoring BIN in an Auction?

Hey guys I'm not sure where to post this so mods feel free to delete if inappropriate.

I'm currently in an auction in egl sales, and I've recently offered to pay the BIN. Now the girl has posted the BIN (before she just msged me) and is taking bids on that...

Is that fair? ): Or allowed. I'm a bit upset since the BIN is super expensive and it took a few days before I decided to give up the money for it.
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