kissmysquirrel, I can't see the problem with buying an aircraft from ebay, in fact it would probably be much safer than buying a car through them, and that happens all the time. At least you'd get a survey..!
I wouldn't suggest just placing a bid, or in this particular case, 'Buying it Now', then sending off your cheque, waiting the obligatory 5 - 7 days for it to clear, then popping down to what ever dark and dusty corner of England it happens to be stored and flying off.
You would obviously get it checked, just the same as if you had met a guy in the local pub and he had happened to ask "Hey, YOU don't want to buy a helicopter, do you?.
Which incidentally was the way I bought my last heli.
If you don't want to be associated with such a vulgar practice as bidding on ebay, give me the cash and I'll do it for you.......honest