Hello i figured out people maybe having many problems with paypal and Bitcoins exchange so i started this thread with some points which may ave you from being scammed
1) First try to deal with only trusted people
2) Check their reputation about how much was the biggest deal
4) Ask the user to open dispute and close it ( un-authorized transaction dispute ) but this may get your account under review .
Main thing is " If a deal seems to be more than fair think twice because it may let you loose your money in the end "
Maybe this thread is of no use to many people but if this thread saved 1 person its more than enough