I think this is one aspect. Another one might be bad code and/or sloppiness. But whatever the reasons are, selling dynamite isn't even helping because some of these spots can't be really used for anything or need follow-up-explosions to turn them into usable space. I've been testing this on test server and there really are only a few mountains/rocks that can be turned into efficient building space. So my advise: before doing this on the live client, test it on test to make sure the result is what you expect it to be (which it isn't in most cases, at least imho).