If what you imply is that there is an aircraft for sale over twelve years of age that has not had a rebuild according to the Robinson maintenance schedule, walk away.
Replacing individual parts when they get to 2200 hours irrespective of their being over twelve years age will most probably invalidate your insurance.
I would be very, very suspicious of aircraft sold on ebay. If it cannot be sold face to face, or by a reputable aircraft sales agent, it's probably a dog.
FWIW