Although 40 bucks is a tad steep, I think it would be a good idea to have a basic subscription, and a premium one. The basic one would allow access to the TA,DA and an MA arena. The premium would allow all these and the SEA, plus a separate MA.
Im not arrogant, but I do prefer to play with people over a certain age. Most parents would see the basic subscription as a bargain and chose that one to subscribe to for their kid. I dont think $22.50 would be too much to ask for the fun we get out of the game but thats about as high as Id like to see it.
If it allowed HTC to hire someone tohelp speed up some additions to the game it would be a good thing.