If mods delete the bad posts, then the spammers won't make their quotas, and they wont get paid. It a simple solutiion, and could lead to the emigration of the parasites.
This is better than the one implemented, maybe some mods are so lazy relying on the reports of the users, what if mods seek for bad posts and ask for a help from active high members to do delete bad posts
Most mods _do_ delete posts without relying on reports, but we still do rely on reports. However the quantity of posts that get made per minute is so high that it would be a more-than-full time job (i.e. probably 12-16 hours per day) to read every post and make a decision whether to delete them. The moderators do not have time for that. More moderators would be helpful, but we cannot rely on just the moderators. The community needs to help police itself, and people need to understand the rules.