I agree with Chris...nothing wrong with blocking a non paying bidder. I also strongly believe in giving negative feedback when required. I will { and have } tried several times to find out if the bidder intends to pay and if so when. I send the invoice from ...wait my 10 days. If I haven't received an answer I'll send my own e-mail asking for payment. If still no answer after about an additional 5 days I'll send another e-mail through . If still no answer after about another 5 days or so I'll send another one from me requesting payment. If I don't hear from them within a reasonable amount of time...it's about a month now I neg them..no if ands or buts about it. I look at it this way if you don't want the item...it's no big deal...e-mail me and tell me and life goes on, no negs..no hard feelings. When they leave you hanging...it's time to give a negative !!

IMO,
Victor