While usage is growing, I would put strava usage by real racers at faaaaar less than 50%.

I'll admit that I've gone out with my club mates specifically to attack a handful of segments up hills in the SF area and Marin Headlands(mainly). But I don't see how that is different than any other group of friends attacking a hill as hard as they can trying to drop one another. It's mainly just a "hey let's go turn ourselves inside out for fun, yeah?" 90% of these guys are racers, btw - only about 60% are on Strava. Also, this is at like 6AM on roads that have (quite literally) no traffic on them.

Anyway, this garners a massive /shrug from me. Do whatever you want. If you really want to flaunt the fact that you're 'fast', though, it better involve pinning a number.

Example: I have a handful of KOMs and some top 10-25 on highly 'contested' segments (2,000+ riders) in the bay area. I am a lowly cat4, and not a remarkably fast one either. Strava means jack **** for how fast you are, IMO.