Won't be many. I have seen one other Tequila Sunrise orange street glide since I bought mine in Feb. I have seen 2 of the purple ones at the dealer but haven't seen any on the road.
I don't know but I really like that color scheme. I'm a sucker for flames anyway.
And I'm a sucker for purple Harleys. If you get one you'll always be able to say "mine's the purple one" rather than "mine's the 5th black one from the left." The MoCo does purple as a limited "custom" color for a few months once every few years. Go for it.
I just saw one at the dealer this weekend. I like purple Harley's, but for some reason the purple with yellow flames looked cheesy to me. It didn't seem like a stock Harley paint scheme.