I have never purchased one through E-Bay, but did purchase my Benz via the internet (AutoTrader.com). Basically was a private party sort of deal, and with any private party some faith is required. I did my homework, faxed/mailed notarized documents, and used an online escrow company. I may have just been lucky but they dealings could not have been smoother. Inspections are key, and a notarized buy-sell agreement is good to have as well. The escrow company (Escrow.com) also provided a bit of a safety net as well. I had my car delivered to me over 1100 miles sight unseen but still felt safe. Good Luck...
1980 FERRARI 308 GTSi
2002 MERCEDES BENZ C32 AMG
2004 TRIUMPH BONNEVILLE BLACK - CAFE RACER