Agreed! I know I'm not the best manager out here but I try not to incentivize spam while making sure everyone follow some rules to make sure the overall environment gets better.
The only other suggestion I can think of, is something I've suggested before: only allow signature campaigns that pay in Bitcoin. The ones paying in made-up tokens have no real cost for the ICO, and thus don't mind "paying" for spam. If the campaign pays in Bitcoin, at least they have something to lose.
I can't stress enough how good this would be. Honestly, if we were to remove all the ICO signatures it would probably not be as big of a problem. I tried my hand at an ICO Campaign once, for about two weeks until it went to shit and I'm never going to bother with it again. As mentioned by yahoo as well there's several "Bounty Manager" teams popping up in Services daily, I doubt any of them would have the rep to actually work on a smaller sized organic signature campaign for a bitcoin mixer, as an example.
Not to mention that I've seen some of these "teams" have groups on telegram with thousands upon thousands of newbie accounts signed up to join any new bounty they'll launch. I for one would not miss it one bit if removed.