Sorry you got negative info at the IDPA club.
BUG DIVISION (class is your classifier scores, division is the type of equipment) is not used in regular IDPA matches. BUG Division matches are normally shot separately as a side match.
However, BUG revolvers like the 442 or model 60 are legal to shoot in Stock Service Revolver Division, and some people shoot them at our club matches just for practice, as you said. You do make extra reloads due to the 5 shot capacity, and probably will be slower than using a K/L frame. As the match director, I allow any legal equipment, including BUGs, in the stock Divisions.
I sometimes shoot a model 60 in SSR Division or a Kahr P9 in SSP Division at a club match.
As to the life of a 442 shooting the power factor 105 ammunition now allowed in SSR Division (recently reduced from 125), I don't expect any special problems. If you shoot 100 rounds a month at an IDPA match, you should still get many years of service.
My concern would be if you started shooting the volume of practice rounds needed to get really good at IDPA, you are going to significantly wear any revolver. In that case, I would get a K/L frame and save both the carry gun and your hands from the battering.
My IDPA revolver is a Model 66, and items like springs and cylinder stops get replaced regularly. The cylinder has endshake bearings to maintain headspace and endshake within specs. The IDPA revolver gets taken apart for inspection and any necessary repair annually, and is strictly a range gun, not a carry gun.