1k hats are permitted because sometimes things go unnoticed by whoever made then and need to be fixed or adjusted. Which is why we only allow tiny edits. It's not something we encourage due to the cache but it's allowed.

If it wasn't for the cache then perhaps it would be okay. But it sucks when something gets edited and uploaded and everyone complains that they can't see the edit and there's nothing we can about it but tell them they just have to wait it out and eventually they'll see it or upload it with a different filename. It's not easy just overwriting graphics, which is why we always upload a test file and make sure everything is okay before we upload the actual filename we want to use. This goes for everything and I've just started doing it with guild hats so to avoid the trouble.