Rotating Gamemode - Why not Weekly Instead of Weekends Only?

I have a question for anyone who knows the answer; why can't the time for each game mode be increased to weekly instead of only the weekend? I don't see why know, as this will allow people who have plans and/or work to play a game mode that they have been desiring for quite some time. And I do not see why this cannot happen as Riot Games clearly have enough money to do so, as League made supposedly $1 billion last year alone, and it is one of the most popular games of this generation. So why not keep the game modes out for a week, and maybe reset the servers or take it off maybe a day or a few hours before the next game mode. Your's Sincerely, Goopy.