Yes, it probably has a lot to do with how much you expect of the tool. If it's just grinding on 2 or 3 saws you have, it'll probably be fine. If you do your dad's/brother's/friend's too, you might start wishing you had something better. If you have 10-20 saws you'll probably have gotten your money out by the time it dies. If it's a side or full time business you're going to be making enough money you can afford to invest in proper tools that will stand up to the constant abuse. Hell, I think Randy has even worn out some of his CC / Foredom tools and needed to rebuild them. No tool lasts forever, not even a chainsaw. But generally the more money you spend the longer it should (you hope) last.