I think people should be able to share ideas and opinions, however there seems to be a very condescending/patronising tone in any response that doesn't agree, or has a different take on mod perms.
A very real reason for some items being sold no mod has already been mentioned - 'The one commercial reason that I can understand, is that a merchant can then offer the same item with a different texture. It's not a model which I support but that's about the only "reason" I can see that fits.' The amount of time I have seen friends put in to learn 3D modeling software, and to make different items,