Because, they will be flagged, much like they are now and lose their earning potentials. Anything earn up until that point will be burned. It might not be a time thing at all, it could be 1000 comments.
The education of these people is absolutely atrocious and that seems to be before they even get to Steemit. The onboarding here is non-existent and none of the suggestions to UI tweaks that have been offered up to improve behaviour from day one have been implemented. Still, something has to be done.
This is a 'get paid for content' site, there should be a few hurdles. work needs to be done before the pay.
I have observed that the lack of education about such comments is to blame.
Which means that they will spam and lose until they will get educated, case in which initial spam won't be reduced by much, and I rarely see accounts over 40 spamming.
I have nothing wrong with reducing spam, it's just that I don't want it to be the equivelent of chemo: poison everything and we hope that the bad ones die before the good ones.
Yes, it should be better outlined at onboarding but, thinking that the introduceyourself tag is filled with bidbots, they come in knowing something.
As said, the education seems bad before they come onto the platform considering what people seem to think being social is.
I see quite a few.
I will always fight to educate people here. I am also doubling my rewards with my own bought Steem from Bittrex.
From my experience, as soon as we educate them, 99% give up their behavior. They do it because they see others doing it, they think they are tricking the system & it has something to do with how they rank themselves as more intelligent than others, hence the sense of righteousness of their actions.
I have managed to get 30+ people to give up their vote selling by talking in detail to them (Discord and comments).
I think that this is one of the problems of the world we are living in, putting ourselves (let's say the more educated) vs the less educated. Any of our rules will be seen as an attempt to maintain our wealth and status. It's how psych works when you are poor and uneducated.
Also for @timcliff:
I would love to talk more about this, I am not here primarily to make money, so we will talk again. I will get more involved in creating this better world. I might also be wrong, but a healthy discussion is what we need.