I said it before and I will say again... whoever designed the arena system should not be allowed to design games! EVER!
Who the hell designs a game system where when you can or can not play is determined by other players you are competeting against? Then there's the whole guild raid system... I'd bet designed by the same person. Again if so they should NOT be allowed to design games. One of the intellectually most deficent design ideas I have seen in my thirty odd years of playing computer games.
The best games are games made when you play when you want, not when you can because some competitor allows you to!
I said before a point system is the best way to go, and you can still make a system to buy refreshes to get a better score... and It's likely there will be ppl who will spend a bunch load just to make 1st or even top 10 depending on how big the ladder is and daily attempt limits.
But as far as I'm concerned, it's either too much work for those involved or they just don't want to kick the hornets nest as it were...
And just for good measure I'll say it again... whoever designed the current arena system for this game should NOT be allowed to make or design computer games EVER!