Typically anything goes in Off-Topic, as long as it isn’t a racial slur, about someone’s family, etc. And if it turns into a battle then it may get moved to E-fighting. Most of the deleted posts are in the classifieds (random bumps from a non-seller, “if i had the money…”, “i wouldn’t pay that much”, etc.) just to try to keep them clean for the person selling.
I checked your posts for the past several months and you’ve only had two deleted (unless I missed one). One that was business related (as someone mentioned), and one where someone was asking for help in one of the car-specific forums.
I can’t speak for anyone else, but I don’t believe anyone is trying to go crazy with deleting posts. There may be some inconsistencies in deletions, but usually because it’s hard to check every post, especially the classifieds which have been a busy area lately. My $0.02.