Because forums.something.something is nearly as common as forum.something.somethingI guess Badspot wanted to reserve it.
But hasn't he automatically reserved all blah.blockland.us
Those are all subdomains.Badspot owns the blockland.us domain, which also entitles him to all subdomains.
So, badspot can do: party.blockland.usO too cool 4 me.
He could do snake.blockland.us if he wanted to.
blockland.us.blockland.us
can't contain a .