I've always thought the scented balls to be pointless. While most of them actually smell pretty good, there are some that are just down right brutal. IQ Tour Fusion is one that did not smell great and while it is a good ball, I think sales suffered a bit just because of the smell.
They HAVE to get the scent right and then you have people that just cannot stand scented bowling balls and refuse to buy them, which limits your customer base. I'm sure there are a few, but I don't think many, that buy a ball because it smells good.
I don't care about colors, my favorite ball is the Radical Reax. The all black original. I'll probably get a Guru as well, which of course happens to be all black as well. I don't want it because of the color though, I want it because it's "hook in a box"!