I just need some input on this, please.

Why would I add multiple Boards instead of multiple forums?

It seems like a lot less maintenance by just doing multiple forums with user groups viewing capability set properly. 

Is there a limit on how many forums you can create? I could have 50 forums on my default board, but my guests would only see one.

Any input would be appreciated.

Note: I have read through every document on this and still need some end-result feedback.