Lol you server admins and your rules....I have 1 rule on my server...what I say goes. I supply the hardware and the bandwidth and sort out all the software.
In terms of the OP, let them have the ore, let them build up their shiny base with all this profit. then when they are about to hit the end game, TAKE EVERYTHING THEY OWN. They are obviously in it for the easy game and dont care about the community youre trying to build so they arent worth keeping, do this and they will leave instantly or fall inline, no need to ban if they dont want to play on your server anymore and you win either way. Some might say its harsh but it hasnt failed me yet.
My motto is let the twats get away with it, but let your valued players know youre doing something about it, play the long game, then BAM nail em. Makes the butthurt so much more....hurtful.
As an example I had someone who managed to amass about 20 ultimate solars and chests full of 64 of everything, I instantly knew he was using the RP2 bag dupe glitch. So I confronted him on how he achieved this, his answer was making scrap and UU and that its easy "if you know how". So I said fine....left him for a few days...he now thinks im off the trail. A few days later I ask him to show me how to put my scrap/UU production into overdrive like his as Id worked out I couldnt produce the amount of scrap needed to make as much UU to make as many resources as he had in the time we had been on the server. His response..."ah see youre making a n00b error and using scrap, shiny dust can be used instead and speeds it up"......"oh cool!" i said, "but how do you explain the fact that thats only in Gregtech and were on DW20 pack".....he pauses.....I ask him again, "where did you get all this stuff".
He then breaks down and tells me he doesnt really play survival and likes creative and theres no way I was going to give him creative access. I explained he didnt ask me if he could have creative access and that I cant make the server appeal to everyone if the users dont tell me what thy want. I then put it to a vote with the other members of the server and told him to leave and come back in 2 days and id tell him if he would be allowed to continue playing. He didnt wait for the response and left, so THEN i banned him as he couldnt even show me respect for the patience id shown him and let the process finish.
There was some shiny dust in an item frame on the server from then on to server as a reminder. If youre gonna lie MAKE SURE IT HOLDS UP!
And user (you know who you are) if youre reading this, ill be starting up a new server very soon on Unleashed, if you want in let me know ill give you a mystcraft age all of your own where you can go creative to your hearts content.
Ill shut up now....