I don't, usually, except for *maybe* some of the fruit flavours. It just tastes bad, first of all (IMO, anyway), but after seeing a video of a can of soda boiled away to leave only the sugar and syrup behind in the pot, I never, ever want to let that stuff near my mouth again.
(Which... um, in all honesty makes no sense considering the amount of candy and ice cream that I eat, but it still make me sick.)