I'm generally against rules myself, and tend to like graphics and I'm even on a fast line but this time I think I have to agree with nemo. It makes good sense. Now the question is how hard is it for you to monitor this kind of thing or even auto-prevent it. Having used upload components in the past, the ones I have used have had a feature where you could tell server-side the size of an image uploaded. I'm guessing that would be the best way for you to do this, by setting an image size limit.