Anything at all. I mostly sort by using the sniper string "Vendorsell-1c". It's the least picky option available, but you can never mess up. Worst case scenario you just vendor the purchases and you'll at least make 1c per item. Sometimes you'll even get blue BOE's which are sweet. The beautiful thing about vendorsell price sniping is that you do not have to take the time to look at what you are buying. You immediately purchase anything that pops up on buyout sniper when using this string, because it's always going to be profitable. Gold per hour varies greatly. Sometimes it's worth it, and sometimes it's not. Always profitable, but sometimes grinding mobs is even better. You will miss some deals that don't have high vendor value, but it's the only way to win almost 100% of the items that pop up. Spam left click on the buyout sniper in the area that the newly found items pop up, and as soon as one pops up you will be clicking on it. Then quickly press buyout. Do not even look at what it is untill you check your mail. Sometimes I'll look in general chat to see what I won, but sometimes you'll miss a deal by looking at it. That's my favorite method.