I have had two sets of bearings go out on my compound in a month (shooting maybe 1000 shots in that time frame). Of course they don't have roller bearings, they have crappy ball bearings.

So I look for better bearings, which cannot really be found. Then I get to thinking, what is the bearing doing anyway? The axle is not pressed into the cam, so the bearing is not even working. It's acting like a bushing. So I get some bronze, mill out a solid peice for my cams.

I got another set of bearings to put into the bow, and shot it over the speed meter at 290. Changed the bearings out to the bushings, and shot it through the chrono at 290. Another marketing gimmick by the bow companies.