Same as you get any membership at any club.
being Roooly rooooly cool.
or knowing someone that knows someone, or being in the right place at the right time. (me.)
Or they're advertising them in 3D world. Something like "sorry, but the memberships for the terrace are nearly full up, but there are a limited number still available for sale @ $200."
got $200 teddee? I can sort ya out