Why do posts to this thread keep disappearing, and why are the current and previous owner so uptight about everything? You act like you have something to hide. I personally wouldn't buy this car due to your attitude and the way you respond to people here. Obviously you bought it to fix it up and sell it for a profit. Nothing wrong with that and you are not obligated to disclose your previous (much lower) purchase price, but grow up and quit treating people like douche bags. If you are trying to be sneaky then don't get mad when someone figures it out.
I agree with everyone else that it would be helpful to have previous info about a car. Not only now, but think 5, 10, 20+ years in the future--it would be nice to be able to go back and see some history of the car (not just this car, but any/every car), including being able to track the value/price trends over time and if the car's story/history match up.
The only reasons I can think of for you not being on board with that is if you have something to hide, you don't want the Buick community to know how much money you are trying to make off them, or you are just after the money and not really a Buick enthusiast at all (or possibly all of the above).
If you have a problem with people wanting info about a car (especially YOUR car, that you have posted FOR SALE to this community) you are in the wrong place...