Even as hard as we try to cut down on spam posts,a permaban for spam posts is not in the rules,the rules are obviously subject to changes,the more reason why it's obviously called unofficial rules of the forum, it's mostly at a MODs jurisdiction,as one could decide to ban for what another may not..
And to make It even more worse,there is actually no proof that they are actually paid thread bumpers, what we are sure is that their input is little value and that means the posts gets deleted.
I think it would be better " User will ban if his post get deleted by moderators
A ban for a deleted post?, you must be kidding me, so many useful members of this forum,of different ranks(High and low), members that contribute effectively to the forum do at one point or the other have their posts deleted by the MOD for one reason or the other,though less frequently than the bounty spammers