If you need to hand things down or simply don't want to use the MPG against anything but bosses because you have really bad luck with perm damage, fine I get that. But that's not the same as others here trying to jump on someone for making theirs a more useful weapon, or implying they are trying to cheat someone.
There are combo's of metal DR where either pure good or cold hit, and sometimes both of them hit. If you look at it as a DR breaker for just about anything that almost always hits with either Pure good or cold and sometimes both, it puts it into better perspective.