I can block stupid bidders on eBay. As soon as they start asking to lower the price, blocked. If they ask stupid questions, blocked. Hell, I won't even answer their messages. My OBO is automatic and rejects up to a certain amount without me doing anything. I list everything in a detailed way, to the point that I'm not really liable for stupid **** (I've NEVER had any problems, EVER. 400+ transactions as a seller) it's all about real pics and a very throughout description. I'll gladly let eBay and PayPal take their cut of they got my back like they do (they've removed almost 6 negative feedback based only on members being stupid and not reading de description).
I'd rather deal with eBay buyers, as stupid as some of them are, than members here. I swear some of the members here either live in extreme poverty or they are just a bunch of losers.