Hi,
I try to buy your plugin 2 time with paypal but I can’t.
I think you certainly loose many customer because paypal is not good system for pay, I have many error who are not, like zipcode who is ok but refused, this payment system is a big bugland.
Think you really need a professional payment system.
I want buy pro version because my hosting tell me than you are the best cache plugin for them, but now, as I can’t buy your pro plugin, I must find other solution.