Question: At what certain amount of deleted post will cause a permaban? I lost count because I delete all this notification on my message because it's already annoying at that time.
Spamming hardly gets one a ban but I think when your deleted post is more than your posts left then you get a temp and a temp ban that is incurred more than three times then the fourth one might lead to a permanent ban.
https://bitcointalk.org/index.php?topic=1684035.0
I don’t see this happening to an old account, mostly an account that is new and gets post deletion most often are the victims. Imagine making 50 posts and 30 are reported for spamming then it could lead to temp ban.
But for a reputable account with some 50 post deletion from a total of thousand posts isn’t affected i think
Spamming is against the forum rules but then 90% of the total posts in the forum are spam posts it is hard to enforce this rule.
If the admin wanted to ban every spammer, there wouldn't be any users left to post 
If someone is getting banned temporarily for spamming, then his posts should be incredibly out of topic, one liners or some other crap. Or maybe the mod was fooled to think you were a spammer since he is getting so much reports because somebody was targeting you, but then this mod isn't right in the head for falling to this cheap trick.