I don't know about your area, but these folks for the most part are not at all timid in their riding. Perhaps they don't try to shoot or stab each other to death like some of the gang bikers, but they're a rough and tumble bunch and if you were stupid enough to mess with one of their rides, you'd likely discover just how rough and tumble they are.
I think your stereotyping a person who can afford a nice bike as rheumatic is rather shallow on your part. I drove a Mini Cooper S at the Dragon in NC/TN for 8 years straight and though not as pricey as some of the other Coopers there, I still had right at $45,000 wrapped up in my little boy and he sported 275 HP to the wheels. I had the best suspension, heads, supercharger, cam and tune you could buy, etc., etc., etc. Because I could afford to drive such a fine machine didn't make me a sissy when I drove it; I drove it like I stole it, every freaking day of the over 4,300 days and 180,000 miles I had it and I have a lot of Camaro and Mustang owner's dollars in my wallet to prove my point.