Yeah, I do add a lot of them as unfortunately this bumping scene is still alive and kicking, despite changes in bumping system. I do tag OP of those threads where I have more proof that it is a scam. Regarding archiving, if I ever have to provide proof, I can use 53M posts! View unedited/deleted posts (search per post, per user or per topic).

Regarding accounts that are used for shilling, as @nutildah pointed it out, I do tag them when there is a strong connection to scam promotion, like in this case I discovered today User NUMAS selling codes for "dirty" BTC with 50% discount. I used to tag them more often (as did others I think) but since those "marketing agencies" as they like to call themselves have unlimited amount of newbie accounts, they simply ditch those and start using new ones. And we are talking about hundreds or maybe even thousands of accounts used.