
Add-ons
The unfortunate thing with PC gaming is that its possible for someone to have malicious intentions.
Steam haven't helped making virtual crap worth actual money (Why anyone wants a stupid virtual badge is beyond me, I sell anything like that to suckers but I have known TF2 some boxed items were going for hundreds of pounds).
As soon as something has value someone will try and take it from you.
Its a shame as PC gamers have access to some of the best modifications for games which are free.