But it's not the high-ranked accounts that are doing the spamming. It's very clearly people who come here just to spam and who create new accounts at will and who have no barriers preventing them from achieving Jr. Member rank.
Yes, that's true but we can't say for sure that every junior member account comes here for just spamming. It would be unfair for the members who come here to contribute constructively. Although the fraction of such posters will be quite low, it would be biased if we let them suffer because of the other shit-posters.