I watch liquidation.com daily. I'm trying to work my acct balance up to the point I can purchase from them. There seems to be a great deal of potential there but as the previous replies state in short- YOU MUST DO YOUR RESEARCH!!! Always get a shipping quote and factor that in when considering price versus income potential. Always look for a manifest if the lot has one, many of these manifests will tell you for example, how many of each different model #'s and items, and, (if they are returns, refurbished, or salvage) how many of those still work as this will also affect your profit margin because, for example, it will be very hard to sell an item that does not turn on. I always do a completed listings search to see how well those items do on ebay. Always scroll down and look at the 'more photos' link. These pics will help in the purchase decision by giving you actual 'eyes on' data for you to consider. They will also help determine the risk factor involved, are the pics all stock photos from the manufacturer or are they actual pics of the merchandise itself? Also remember there are 'auction snipers' there too, so when looking at the current price, make sure to see how much longer the auction has, because if it looks like a 'too good to be true' deal, chances are it is and there are 3 to 4 bidders waiting for the last few minutes, just as we would on ebay.
These are just a few things I've begun to practice in preperation for when I do reach a capital level high enough to purchase from there. Hope Ive contributed more than detracted.