I've done that in the past. My only issue with that is that sometimes drives away bidders if you do not say you take PayPal.

So either I state that I take PayPal and increase my fees and possibly get more bids, or I don't include PayPal and possibly get fewer bids.

My thought is that I will just state that I take PayPal, and then when someone states that they will be sending a check or MO, I will let them know that I will give them a discount on the transaction.