I remember the Cannock Chase trail pixies having to have words with some guys who were taking a shovel to one of the Monkey descents (can't remember if it was Upper or Lower Cliff). They were trying to dig in a shortcut to go straight down, so they didn't have to do the switchbacks. Although I guess that's more vandalism than maintenance.
If you have time to vandalize trail because you don't like them you that time to volunteer and help build them. Then you can give your input and save every one time and money.