I would pay for a permanent ARURF mode
I haven't spent money on this game since I started playing in Season 3. I got RP from getting an American Express Serve card and bought some skins with it, but generally, I personally don't care about spending money on skins.. I understand people who do, but it's not my thing.
However, if Riot offered to unlock ARURF as a permanent game mode for $9.99 or maybe even $19.99, I would JUMP ALL OVER IT and I am guessing enough people would also do so to make it viable and make RITO a lot of $$$.
ARURF is the most fun I have in this game and when it goes away I just simply play A LOT less than when it is here.