For what it's worth: Last 2 years I bought "fun cars". An e36 M3 and an e39 M5. Both cars were "fun".....exceptionally fun actually.............for cars. But they never came close to scratching the "itch". I find myself wandering around Cleveland when I'm bored on the bikes. I never just randomly cruised in the bmw's. Maybe once or twice when I first got them but then it turned into, well I have to go somewhere and can't take the bike but it's still nice out so I'll take the fun car.
So far, I've always found myself going back to 2 wheels. And right now I'm plumb out of room for anything else or I'd be thinking about getting another M5 again, man that was a great car, don't think I'll ever own a better car.
Chris, come be an I group hero with myself and a few others its a good time.