60 or more posts a day with one account is doable and you probably won't be banned, but you will draw a lot of attention for your account and will be banned even if just a few of your posts looks like spam.
If you are not sure enough about the quality of your posts, better split them among 2 or more accounts, if you are going to post 50+ posts a day, so you won't draw so much staff attention to you.
Would this is somewhat of a good idea? So both accounts are in the signature campaigns (maybe the same). One account for top quality posts, no spam-like posts. The other account would be for not-as-high-quality posts, and also spam-like posts.
I think this is a good idea, as if one is banned, then you've got the other (presumably the high quality posts one
). It would also not "draw a lot of attention" to the accounts. This would (probably) be a way around the limit on posts per day for some signature campaigns too.
However, what if somebody makes a connection between the accounts when one is banned? Wouldn't this have an impact on the other? Does this mean you have to keep information relating to both accounts under wraps, to prevent people from making connection? Or would people (this includes staff) just not care?