I’ve bought two cars from sellers on eBay.
The story of the first is in the The MGB Saga thread. In a nutshell: Looked complete, needed floorboards. Got the car. Needed a lot more than floorboards. Still in restoration, more than two years later.
The second I bought last month, a 1963 Triumph Herald convertible. Some details here. After towing the car 900 miles north, the carburettor was fixed as well as it can be. The collar that holds the distributor has been welded, and wires going to the distributor have been repaired. (Electronic ignition has been fitted, BTW.) It runs great, and garners much attention. It’s in the shop right now, awaiting the parts to rebuild the front brakes (caliper repair kit, brake pistons, rotors). Also, reverse is not available. They’re looking into that at the shop. If all else fails, I can get a remanufactured transmission for $900.