I bet you'll only be able to keep that up for an hour or so. Blockland hosters are always gagging for as many players as possible to join, so you'll get depressed when one or two people swing by, having been avid forum lurkers, and then you'll remove the password.
I think with the release of V9 there will be an explosion of cool and innovative servers, as well as an increase of players as more return to try it, and more buy it. I don't think dumbasses are going to just put up a passworded server and wait until everyone decides it is the coolest server on the planet and make a beeline for the forums to discover the password.