Regardless, there's no point in brute-forcing a vent that only ever has like six people online. If it was directly related to how the osu! community functions, there'd be a reason for those guys with the flashlight thing to attack it; but as it is, the most likely attackers would be either texan car guy or some kid that got banned once.
...Not that it'll ever be investigated.
Anyway, guest accounts are only supposed to be temporary. Find an admin (anyone who doesn't have a [guest] or [user] tag, other than Pokebis) and ask them to make you a user.