That's why I suggested that trading it in only gets you a portion of the credits you spent. Maybe 75 percent?
I think it would ultimately get a lot more donations, especially from old school donors. Trading in some old cars makes paying an extra 100 bucks for a casino penthouse not so bad. Or now with the number of new cars being added, I know at least for myself I have three cars I'll never drive again. Between those cars I've got about 150 (or more) dollars in credits wrapped up in them. I'd happily trade them in for a portion of what I paid and get something I'd actually use. Even if that means spending an extra twenty or so dollars to make it happen.