Since there are no many admins/mods online, so they could penalize those who advertise
Uh, yeah....hopefully you've gotten the message that not only is advertising in your signature space allowed, it's probably the biggest factor that drives traffic to this site, and if members weren't allowed to include that advertising bitcointalk would be a much less lively place than it is.
But I agree, it certainly can be annoying. Not the advertising itself, because you can put avatars and signatures on ignore, but the posts being made by sig campaigners/bounty hunters themselves. Tons of people from around the world flock to this forum because they've heard you can make money just for posting, and a lot of them don't necessarily have an interest in cryptocurrency or a lot to say about bitcoin or anything else. The net result is that there's very little discussion going on, and there are a lot of garbage posts polluting threads across many sections--and this has been going on for years, OP. Just get used to it, because Theymos definitely isn't inclined to change anything anytime soon.
Okay, sorry for expressing my opinion. Sorry if my opinion was offensive too.
No need to apologize for stating your opinion, bro (or sis). You have a valid point, and it's been discussed to death here. Take note of the merit system here: that was put in place primarily to combat account farming and shitposting, which is usually done by people advertising stuff in their signature space. It's much harder to rank up now, which limits your signature space and thus the amount of money you can earn through campaigns.