Hi , welcome to the forum...
I have no problem with them. It gives me something to look at between 90 second intervals. While I have seen these for over 900 posts now, I am just being honest in saying, when I need to switch my attention to words instead of banners, etc...I find enough control to do so. But if bothered by them it is your right to say so, which is understandable and freedom of opinion.

Also, with the bandwidth issue, there is a limit on characters for signatures as well and would think this was the reason for the limit, so we can only put up to so much. I too , don't care for HUGE images so I whittle mine down 50% or so.
That said, as Aowl suggested, you can choose to see these or not and perhaps why this was put in place, to make everyone happy.

If you decide to enable seeing them, hey just ask, i'll make you a fly by.

Not a problem and once again, welcome!
Cheers,
Paul