It's happened quite a bit in this thread, but it's really silly to take something that means 'there's more to cat 5 races than crossing the finish line first' and interpret it as you shouldn't try to win.
As to riding for someone else's pleasure, read Domestique. It's a complex sport. The lower cats are supposed to be about learning the skills and nuances of the sport so one can safely integrate into higher levels.
Most cat 3s don't know much about the sport. Christ, I know guys who have been racing for 25 years who don't know much about the sport.
If you don't like your fields talk to your promoters. We don't hold much sway on this particular spot in the interweb.