Can't speak for all but I know some clubs like the CAS shooters to use "mild" loads for a variety of reasons including a little less wear n' tear on the "steel" downrange.
I've been teased about shooting .38 Special before but hey, I could barely afford to play the game in the first place so I went with a round I thought I could support
I've shot with some serious "speed freak" gamers, and shot with a group that would pause to deliver old-time cowboy lines like "Black Bart, ya shot my paw, I'm a comin' ta get ya" before finishing a run.
Personally I like the guys with the sense of humor. I'll go for style points LONG before timed score.