Mod:  Please move this if I posted to the wrong sub forum.

I'm new to BTC and see a good number of ads on LBC for people buying BTC for Paypal (sent as payment for goods/services) at slightly higher than market rate.  How much risk is associated with this?  Some of these sellers have 100% feedback and 1k+ confirmed trades.  

I am aware of the whole charge back issue with Paypal MC cards purchased with CC.  Does the same principle apply here?