if stuff goes wrong, i would rather blame the host myself, not go through some kid on the forums.
I have to agree with Bisjac on this one. The exception I make is that I trust Ephialtes enough to be responsible with such a system as he has already demonstrated a sufficient level of maturity and goodwill in offering the RTB service out of his own pocket.
The idea of supporting dedicated servers through clans may make sense in other games, but most of the clans in Blockland are just power-trips for their "founders". Notice how almost all of them start off with a chain-of-command structure with the topic creator at the top? Few of them have truly dedicated members, and fewer still have members that are able to cough up money each month/year.
Technical issues like key security and add_on management aside, I just don't think you will get anywhere near 30 users paying for the service.