Some actually do, but it's VERY rare and I wouldn't rely on them too much, alot of people are bullshitters saying they skim over a 1000 cards a week and they will expire in the next 6 months.
There were 3 ocassions I bought full info (PIN included) from Russians who had no use for them and they worked fine, but you may not get as lucky. You're best doing it yourself if you want to be sure you're not getting ripped off; RFID scanning and logging is the in thing now, look into that. Obviously skimming is still an option too. I'll post more PIN and general info in here later when I get more time.