You are not crazy at all. I do it as do others on here.
My Merc is now 18, has 245,000 miles on the clock and it is cheaper for me to keep it and maintain it than sell it for peanuts and have to lay thousands out for something that won`t appeal to me.
Others on here have Lexus cars that are older than my Merc, just wait for them to tell you what they think.