I agree Doug. Bid what you want & be happy either way. If you win you get your stuff at what you wanted to pay. If you don't you still have money to buy something else. And you made the other guy pay more!
I usually like to just bid what I want to pay. If I get out bid oh well. If I have been out bid on everything that week I might throw in another bid. All depends on the week if sales are good I might buy more. So try buying & selling & have a blast both ways!