yup, very low, It cost close to that in parts, belt, rollers, H2O pump WITHOUT the gears doing it yourself. I'd ask him exactly what he does for that price. Given that your gears are worn I suspect your tensioner may not be working properly either which will require at the very minimum a disassembly and diagnosis. This may be one of those situations that dcrasta should make some excellent points for an certain aftermarket tensioner too.
btw I heard the most torque applied to the belt is at start up when everything is still and cold, so you may not want to start it either
