"Well they have no way of knowing whether you have a banned "main" account so it's pretty subjective..."
Exactly, the ruling of alternate accounts lies strictly with a technicality and unless your IP matches another account, it is down to the discretionary rights of the admin. If you are not evading a ban, then there should be no reason to fear if you ever feel the need to make an alternative account. Granted, I see them as pointless and I only suggested it as a viable option, not one I would necessarily condone because I actually do not have any alternate accounts - I don't see the point in needing one nor wanting one when I already have one but I know that others do for reasons of their own.
I apologise my post has led you to be confused, friend... That wasn't my intention making this, unless you are baiting me of course, then fair enough. :)