Yes you'll get more buyers for the higher priced items. there are a lot of impulse buys from people who have some money in their pocket but not enough to meet the selling price. I would accept it, ask the credit card issuer about how to protect against fraud. Any number of fraudulent payments are possible according to what I've heard about ebay etc. Probably the best way is to sell to people who have a good reputation that you can check on i.e. references etc.