Yes be careful! Also have a set amount you are willing to pay and no more.
Lose the auctions if it means you are paying to much.
Its not just eBayers buying on that site. Regular retailers are too and businesses for their office and regular people combining their resources to get a great deal. And who will almost buy at retail to save a 100 or 200 but close enough to retail so you can't make a profit.
Only bid on one auction at a time at least in the beginning. One per day. Because if you bid on more than one and dont have the cash to pay youll get in trouble with Liquid.
Every purchase you make ensure to fully inspect and test within 3 days or you cant get a refund.