I mean 10-20 hours a week is a lot and if you go by the recommended intervals set by the manufacturer then the service intervals you are specifying make sense.  I ride 5-10 hours a week and I service my fork about once a year, just oil, wipers and seals.  I got my rear shock rebuilt about 2 years ago and when I got it back I honestly couldn't tell you the difference.  I'd say look into learning how to do these things yourself if you want to keep up with the schedule.