I'm not sure it makes sense to have your second non-GPL license be BSD/MIT; wouldn't it be better to make it some proprietary license, licensing it specifically to the customer who pays for it?
But anyway; in my limited anecdotal experience, I don't know that all companies would bother sharing the BSD/MIT code anyway. They tend to be occupied doing their own work, not redistributing whatever open source software components they got from somewhere else.
Some companies might; but the point is that, I think that, no, they would not necessarily pay for it and then share it with everyone else.
But anyway; in my limited anecdotal experience, I don't know that all companies would bother sharing the BSD/MIT code anyway. They tend to be occupied doing their own work, not redistributing whatever open source software components they got from somewhere else.
Some companies might; but the point is that, I think that, no, they would not necessarily pay for it and then share it with everyone else.