they over charge/rip off customers because after giving you an half price/discounted MOT they need to get that money back, so they find fault with diddly shit
i remember going into that fast-fit chain that FORD bought and sold a few years back, i wanted a quote for an exhaust, they put it up on the ramp, they next thing i know im being quoted for worn shocks as well, they weren't leaking or bouncing more than normal, the motorist is a cash cow i never used them again