They will because they are not permanent MLS members like they are, it adds interest to the league in non-MLS markets and you have 4 more TV markets to tout.
As I said before, it's obvious that you do not think the same way that business owners worth billions of dollars think. There's a reason those people are billionaires and you aren't, and why you post ridiculous ideas on message boards and they don't.
The current MLS expansion team fee is $200 million. And yet you think that the people running the league and the teams are going to turn down $800 million, an amount that will almost certainly increase as time goes on, in order to essentially let four team in for free.
Yeah, that's going to happen.