I think as well that there could be aditional option to play a game in "hole" days. While you are enjoying this game, why should you be forced to focus on the other games? I once met a guy which played like 20 continual online games, he looked kind of weird, but I learned back then to understand that once there is a passion for something, it will be satisfied - it depends just on who will take the money.
Well once I will be rich, I would possibly do the same and enjoy every evening with this. Its just, I think, this aditional feature have to offer something different than another PL option. It should somehow recognize which days you doesnt play anything (to have no bigger advantage in terms of checking strategy, and will not play like 3 games per day), it could force you more into competitive games (so there will not be a league, but maybe two round cup) - which means not so free behaviour in terms of strategy, and I personally think that for this cup could be introduced the option to play with a different team, so before beginning you will go through some kind of fantasy draft (do you know NHL series from EA?) and then play a cup. Then might be 15 dollars sufficient?:D
But then while you are relegated from such cup, you should wait for its ending before could join another one.