the closest thing i imagine badspot will ever incorporate into the game to this (and this is one seriously huge loving stretch) is a trial server system
'trial players' can do quite literally NOTHING but watch all the other players do neat things. put simply, they're in spectator mode for building and deathmatching and whatever the hell the players on the server happen to be doing at the moment
despite the fact they're doing ABSOULTELY NOTHING, they might get an idea of what blockland is about from just looking at the players do their thing online
maybe the server could come with new, extra preferences like maximum trial players on a server at once, trial player chat, etcetera
...or alternately, free weekends