The removal of asking prices on The Exchange always has been a big complaint of mine.
Don't know why people find it necessary to do that. You can just overstrike or gray out asking prices and mark the knife as sold, without disclosing the actual sales price which may be different.
Easy to change the rules to prevent it but the people in control here have never wanted to do that.
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FWIW, in order to prevent this, when I buy a knife on The Exchange, which I did recently, in my "I'll take it post," I'll usually say something like "I'll take it for your asking price of $xxx" which the seller cannot remove. So, if I get it, people will always know what the knife sold for.
I've noticed that some other people do this as well but, if everyone did, then the selling prices for most sales would remain out there.
Of course, this won't work for PM sales which are entirely private.
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As far as Reddit & FB are concerned, I've never used them.
I've got a lot of knives that I've wanted to sell for a couple of years but I've put that off because of the drop in prices, here & elsewhere, but, I'll probably put some of them up for sale on EB (despite the fees) because it's easier to sell stuff there.
Can't sell on FB because I don't & never will use it. Reddit seems too amorphous & disorganized to me but I might try to sell some autos/balis that I can't/don't want to sell elsewhere, if they don't sell here.