This is an awesome idea! I would love to play in a legue just like this.
My local league discussed this years ago...never went anywhere with it though.
I understand now the why for the first time. But playing in a 16 to 20 team (or more) mixed league does the same thing.
After playing in an AL only league two years ago that became one first and last adventure into Onlyland. Too few owners to make trades with. Too few teams to play against. So I prefer a deeper mixed league myself because I like it harder to find the players and an interesting FA pool full of possibilities more than names. And plugged into all of baseball and not just half of it.
So since you can get those same values in mixed leages, is it that Only league owners prefe
The big problem is that injuries can be a HUGE factor in who wins the league. If your team has a star or two get hurt, or even solid contributors, forget about it, because the WW is filled with crap.