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Hmmm, I guess we see $15k differently. To me that is just about an hour of working to get.

I was about to say that $15,000 is a little cheap if you're wanting to make this a more exclusive thing.

I am pretty sure that spawned below level 30 aren't guarded as that is against the rules so there shouldn't be anything to charge is for anyway.

Oh... Couldn't you just surround it with chests or furnaces?

I've never had a problem getting a spawned above level thirty world guarded. I don't see any reason to limit this to VIPs or to have it cost money.