I agree, fragging a frag is bad mojo for the hobby. All of my frags are solid 1 inch pieces from my colonies. I also think the size of the frag isn't apples to apples in all cases. For example, an ORA red planet grows like a weed, it's hardy as hell, and a SOLID chunk should go for 30 bucks or thereabouts.
on the other hand, I have a nub of mattv orange envy. it's FINALLY starting to encrust after 2-3 months of nothing. BUT, it's also a rare acro, and matt's corals have a reputation for being very finncky. The guy who I traded it for , Gregs corals, has already lost his orange envy 3x. I can understand, not wanting to cut huge branches off.