I get most of my sales and make most of my purchases with PP, very few want to wait for cheques these days, or pay high charges for Postal Orders in the UK. PP acceptance also aids impulse buyers to buy, buy buy.
Had far more hassle when buying with a cheque than ever using PP, give me PP for buying every time. At least a deadbeat seller can have the payment pulled back from him if he cannot be bothered to post your win, try getting a cashed cheque refunded, it is no fun I can tell you.
To me the only thing worse than a paper cheque is an e-cheque, goodness know why people use them, jokingly supposed to clear in 4 working days, more like at least 10 working or is it could not care less dozing days
Given the state of many sellers abilities I look forward to PP only here too - waits a few seconds for a tirade of opposite opinion, tin hat on