Your Mom lists an old vase she has and doesn't like much. She needs some $ and its been gathering dust.
On the WE LOVE VASES forum, someone sees it, its quite a rare vase, but she has listed it in the fondu section. And has misspelled "Vaze"
Someone on WE LOVE VASES forum posts the auction, laughing at her mistakes.
Someone else on WE LOVE VASES forum is pissed because they assumed they were the ONLY Vase collector who found it (he happened to be looking for a fondu set for his wife).
Now there are a few more potential bidders, who might try for a bargain (added to the million other ebay users who might like Vases and don't bother with forums).
Person who posted auction link, obviously wasn't going to bid, or he wouldn't have posted.
Person who was going to bid, MIGHT still win the auction (as before it was posted he MIGHT win).
Meanwhile all NON forum members who are going to bid have no idea, they have yet another person/s interested.
So all this means.. your Mom has a little more chance of getting what her Vase is worth.
Mom is happy.
Winner is happy as he got the item (might be more than he wished, but he paid what he could afford and what he thought was worth to him/her).
Loser/s are unhappy, but it obviously wasn't worth as much to them as winner.
Thats what auctions are all about.
If an item is correctly listed, well described, nice picture etc. Then outing it here is inconsequential, more people buy posters than join poster forums (or read them), and especially for better items (which is surely all that matter here, cheap posters are dime a dozen surely?).