CMs were always about stacking correct classes / specs and getting "BIS CM gear" (ESPECIALLY in MOP) rather than knowing how to play your class well. Which I think is Blizzard's fault and invalidates any value or prestige they want to attach to CMs. I hope they fix this shit in legion CM system.
But yeah, I don't know how selling boosts makes anyone more "noble" than playing AH or farming gold. Gold is gold. As long as you don't bot, exploit or scam there isn't "noble" or "evil" way to make gold. You can click garrison all day, farm your favourite gold spot all day, flip AH with TSM or sell boosts, it's same thing in the end.
Boosters getting richer is a derivative of average joe getting richer so they can up the prices for boosts and still have plenty of customers.