1 : 1000 to play in the alpha, so not really necessary. Especially because you will not have a hard time getting a free invitation, I think. You can always pay 50 bucks, to wait for October, the game will have a few updates then, and you will not be behind everybody else in a significant way.
2 : If you get an alpha invite.
3 : Not for now I think, but only devs can answer that. I completely understand, I am heavily disabled, and a lot of things I ask make no sense to a lot of people.
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1. No problem paying the $50/$100, particularly since it includes game time. The $100 will start later in September, right?
2. How do I get my greedy noob hands on one of these suckers?
3. Bleh. I haven't seen an MMO without invert in years until I messed with another big MMO that is releasing right now. A game has to be freakin amazing for me to fight with my mouse while playing.