For me, it's because it's a Saturn. I have owned nothing but Saturns since I turned 16. When I first saw the original SKY roadster (remember the wierd looking blue thing back in 02?), I knew that eventually Saturn was going to release a convertible and now it has finally arrived. When I saw the original sketch they released, I fell instantly in love and wanted one since then.
Every time I drive our demo at the dealership (I got to take it on a nice long back-country-road drive bringing it home from display at a golf course today) I fall in love with it just a little bit more. I wouldn't be interested in a roadster right now if it wasn't for the SKY.