I'm going to be in the minority as usual, but yes I'd like an uo-auction like style website.
Two reasons:
1) While we have an ingame auction every week on Europa, it's only a few items per week so as a buyer it's severely limited, and as a seller it doesn't have starting price system (all items start at 5k) so there is a high risk involved in putting very expensive items (and putting a high reserve on many items is not a practical solution as the auction organizers would surely not like to have a lot of stuff without bidders). I really like it but it's clearly a different use than what uo-auction was.
2) While, because there is no other choice left, I use as everyone the infamous search engines that shall not be named, there are many things I don't like at all about them: First the fact that beeing limited to Luna (and a few vendors in Zento and Umbra road), it does create a monopoly on those shops. As a buyer the prices are thus inflated and it's impossible to find any good deal (some people even use a bot on bots to check all good items really under market price) and as seller you have to pay a rent to place vendors, which cumulates with the ingame cost, making it basically impossible to sell anything that isn't highly sought after. Add to this the fact that non-listed shops have lost a lot of customers and basically the end result is that it has turned the entire vending system "professional", which is not my idea of fun in a game. On Europa at last it has became totally impossible to find any shop selling stuff like music gears, halloween candies, colored boards or even bods. Add to this the fact that it is intrinsequelly based on something illegal (scripting bots who check the prices) and I deeply regret the times where those search engines were not existing after all.
So again, yes, I wish there was some kind of uo-auction website back, somewhere where I could list many relatively low-turnover but not so cheap items I wish to sell without any fixed cost. I'm pretty sure it will work very well, especially if the Luna search engines are shut off (curiously I wonder why the accounts have not been banned, surely some people have complained and it's a clear violation of TOS).
Now somehow I wish it could even be ingame, but I don't think it's doable unless vendor costs are divided by 10.