I have seen more of this than I have blatant cheating, but I have definitely seen both.
I also run I to the problem that a lot of middle aged and older guys at 3.5/4.0 aren't used to fast, spinny, serves:
Had a dubs line recently where one of the guys called 2 serves that were on or just inside the line out. Questionable but I'm used to that and gave him the benefit he just wasn't used to the pace. Then get to deuce (no ad scoring) and calls a ball out that was 2ft inside the line on a kick serve.
Agreed--if you are a big hitter and fast server your game is more impacted than a pusher type. I also think that big hitters are more likely to be basket cases and more prone to bad calls impacting their psyche.