I like that too. If I want something, I can buy now, I don't have to wait for the auction to end, monitor it constantly, get sniped at the last moment, etc.One of the things I like the most about Reverb is the lack of auctions. Here's the price, make an offer if you want. If I want to buy something on Reverb, I can always Buy It Now. eBay is indeed, a dinosaur.
And for a seller, you can totally control what price you get for a piece of gear. You're not left waiting and wondering. Sure you could do a reserve auction, but what's the point when you could just take offers?
I don't think auctions would be good for Reverb, because it will ruin the ease and simplicity for everyone of "Here's the price" or "Here's what I'm asking, but make me an offer"