SUP is cool. It's keeping the paddling stores in business. In a way similar to rec boats. People buy them and hang em in there garage next to their dh bike, cx bike, roadie, tri bike, fixie, Dagger redline or disco, and maybe a brand new diesel from eight years ago. Not to mention climbing gear, touring gear, avie, it keeps going... Now put this garage in the Front Range and park an Audi or a Suburu in front and you have a picture of the demographic.
All kidding aside, sort of, they are easy to learn to paddle, and not scary. And actually pretty fun. The greatest thing about SUPs, it is something the GIRLS can get into. Will my girlfriend ever want to paddle Foredyce Creek with me? No and thank god, will she SUP Foredyce Lake with me sure.
If you are not convinced, go to Hawaii, find a mellow SUP break and checkout the lineup, if all those girls in next to nothing doesn't make you a believer, you probably should buy a one way ticket to SF, the Folsom St Fair should be right around the corner.