The only negative point I can think of is that it might be harder for you to sell the car in the future if potential buyers are put off after doing the same check as you. I sold a car many years ago which had served my chauffeur company very well indeed for several years. It was always immaculate condition and it had always been very reliable.
A few days after selling the car the buyer came back saying he'd found out it had been an insurance write off and he wanted his money back! I was astonished as it was the first I knew of it and I'd never done any checks like that. However, he admitted there was nothing wrong with the car, but he just wasn't happy. I stood my ground (I only had his word for it anyway) and I never saw him again.
It might put future buyers off Chris when you come to sell the car.