Is there really a gap in the market for more sweet drink options? I mean, really, try buying a cold tea drink just about anywhere around the city (don't bother at Starbucks because you will never get one), and your option will be very low indeed. But you want a drink with sugar in it, well, you don't even need to look; one is bound to hit you in the face, faster than a Kenny G medley.
And after that you can take two more steps and another kiddie cocktail will smack your head again.
Anyone who can't find a sweet enough drink to satisfy themselves is pretty much already in a diabetic coma.