Alright, lets start this off,
This is not a good idea,
"Why?" you may ask, and I shall explain it to you.
The renting of universe space will be extremely harmful to the game for multiple reasons. First, lets start with a hypothetical. The egotistical rich mommy's boy Bob decides to start an organization, lets call it "BobCorp" for the time being. One day, Michael from the much larger "Mike Inc." decides that he wants declare war on BobCorp. Bob, being Bob, decides that he is not having it and goes to NovaQuark and "rents" his system. Now as you said in a previous post:
The bit that I am focusing on is this bit:
...administered by players who actually pay for this service, with their own rules and restrictions.
So, Bob, after buying his system, decides to exercise his ADMINISTRATIVE RIGHTS, and bans all of Mike Incs members from his system, now Mike and his minions cannot attack bob's system and bob continues on being a carebear. Mike responds buy enclosing all of Bob's territory like a warmongering amoeba. Bob, after seeing this becomes FURIOUS AND SPILLS HIS SPECIAL HOT CHOCOLATE THAT HIS MUMMY MADE HIM. He goes back to NovaQuark and rents out ALL of Mike Inc's systems and bans everyone except for him and some of his sniveling friends and they go through Mike Inc's systems, pillaging and looting everything while all mike can do is watch as his months worth of work burn in front of him, afterwards, Bob, having taken everything and destroyed all of Mike's work, waits for the month to end and cancels his renting of Mike's systems, because he is happy having his one system, and for his safety bans everyone except for him and his cronies from entering.
THE END.
See how your plan could be used in the most ultimate form of Pay to Win?
Cheers!
rmhenn