The closed beta has no cost. Qore Episode 6 has a $2.99 cost, but you get an invite via buying it.
so the closed beta costs....
Not at all. You are paying for an episode of Qore. The beta is an added bonus. Not to mention, people who did not subscribe to Qore nor purchase any episodes have received invites to Home.
So they pick people that bought the episode and just random people?
That information is not known. Based on what the email says, anyone who purchases the episode, be it standalone or via a yearly subscription, will get an invite. We wont know for sure until more is said, or until the episode is released.
If you want a guaranteed spot in the Closed Beta, you could shell out 3 bucks for the next Episode of Qore and get it. If you don't mind waiting a while, it will eventually be free.