I agree with everyone else that this would be a waste of your own time because your 1,000 hours of ramp time will just make others wonder why someone with that much time is so terrible.
But, I do not see anyone getting violated by the FAA or destroying an engine over this. The FAA does not have enough enforcement power to police ramps for this and I really don't think someone on the ramp would report seeing a 150 do a 2 hour runup. They would just assume it is a MX issue or something else. The only way I can see someone getting reported for this is if they did it at the same airport all the time and blabbed about it. It would be very hard for the FAA to prove which of your flight hours you actually had no intention to fly. And then if they could find what flight hours you logged with no intention to fly, they would have to prove you were going to use those hours towards required flight experience. A crime would only be committed once you applied for your ATP (or another rating) with those hours. And if you do a 1 hour runup and then to 1 trip in the pattern, it would be legal. Also, the engine would be fine for an hour on the ramp due to the airflow from the prop, unless you are doing this in the south in the middle of summer for hours at a time. Mechanics do extended runups all the time on the ramp.
But back to the fact about how stupid this would be. If you are going to buy a plane to build time, there are better ways to cheaply build time. Find someone else who needs to build time to split the plane. Then put some foggles on, do some cross country flights at 55% power, and practice some approaches. 55% power in a 150 will be very slow, but it will burn very little fuel and you can split the fuel costs.