I guess the bottom line would be what you going to do with the bike...If you brought the 'dang thing to ride forget the spinners...if you brought it to look at(why would be my first question!) then put spinners, lights, smoke, mirrors...whatever floats your boat...either way...
Ride safe...
This is the key question. However, I do not think that it has to be so black and white. I have dumped a lot of money in cosmetic mods...even put a stereo on the Bus. but that doesn't mean I don't ride the hell out of it. I am not trying to drag my knee, but I like twisties. I am not trying to break 200mph, but I do go fast at times. therefore, I don't need a full system or to do all the weight reduction mods.
When I was considering wheels, I considered spinners. I almost bought some. In fact, if Rimmax weren't crooks I probably would have.
I just went with chrome wheels, and i love them. Now I have learned a little more, and if spinners are only good up to 110 mph, I wouldn't do it.