Originally Posted by felgall
Perhaps 10k would be more appropriate maximum if it is to be an avatar but 150k allows them to upload a proper photo that you can then compress down to under 5k when you create the avatar. Having the limit around that figure ensures that they don't stupidly try to upload an image that is tens of thousands of pixels across. It will remind them that such huge photos are not suitable for the web.
Yep, that is exactly what I was thinking.