Please don't put a label on all of us septic inspectors and installers. I don't label you, for what you ride or your occupation. we are doing are job. mostly 100% is a BOLD accusation. Don't pump or inspect sludge depth every three years. No one said you need to pump every three years, they tell you to inspect, most never need to pump in three years, it is based on sludge depth.
If your pumper is one of the mostly 100% crooks as you say please call the county and state to complain. The state web site has a complaint area to contact.
Thanks
Howie