I was also banned from my steam account because paypal choose a transaction I've made with Valve to check my identity. Their system was faulty and after confirmation(Phone calls to land line and CC verification), It took several phone calls & more than a week of back & forth to get everything in order.
Mean while, I lost access to all the games under my Steam account because Paypal stopped 1 payment & I had this account for 4 years. I had almost 20 games in my Library & couldn't play them until paypal released my money. Sure, I understand they wanted to be paid, but having total control over 20 of my games is really frightful.
It took me almost 2 years before I bought another steam games & honestly, if I can avoid using this kind of system, I will. I rather have a boxed DVD than letting someone have total control over something I paid for... I mean it's not like I don't know how to get the games for free...but I don't pirate because I feel it's wrong, and this is how they thank you... Anyhow