I try to make good purchases when it comes to cars and intend to keep them all. I think it's nice to "build a relationship" with a car, with time and exclusivity (of driving the same car). I guess for me it's about the ownership rather than trying to experience as many cars as I can.
Kept all of mine so far (which is not many by comparison to a lot of people here), including my first car, a Mazda MX6 GT. It has a huge dent in the rear bumper and the quarter panels are a bit deformed from it too, from a woman smashing into the back of it one morning. But I still kept the wreck and plan to restore it one day.
1989 Mazda MX6 GT 4WS
1997 Porsche Boxster
2006 Lexus RX330
2007 Maserati Quattroporte Sport GT