I'll be on the lookout for sigarts exceeding the limit myself in the same way, adding spoiler tags or just deleting images, remember guys, it
is still a forum rule so we do expect you to abide by it.
And like Keaton said, it's not like the current rules don't allow for a signature of decent size anyway, we're not overly concerned about text, but 575px x 400px is more than plenty, mine for example is only 520px x 200px, so there's still plenty of space, just as an example.