But then you also need the effect of new vs used. We have items that provide a +1 bonus, so now do we need the system to handle fractions? Or are second hand items simply more likely to break once that is added in.
I'd view it at a more abstract level, used items are simply less valuable than new ones. You
could involve breakage, but that would make it a lot more cumbersome I think. And magic bonuses shouldn't depend on stuff being used or new, so fractions wouldn't be a problem there.
