I personally was scammed over 500+ When I sold 2 WoW Beta accounts that worked 100% Like the 2nd Video I got scammed by the Charge back but not only that once they took the money they told me I still owned money and had to refund them yet they just took all my money..
I personally fought for months and months even over 3 years later I called and they do nothing I had to send it fax's with most personal info photo ID's and such.. Then they tried get Social Insurance Numbers not going to happen.
I mean theres a site been up for years dedicated to PayPal Scams.. Were safe as the buyers and its true.. But I think you should offer another company also because PayPal are scammers.
I suggest using 2Checkout I personally used them for hosting and other related things in the past... I think cost me a 1 time $50 fee.. Also Vbulletin supports it if I recall as a Payment API!