hello, i think it would be better for the server if there wasn't any admin shops. i mean think about it its not really survival if they can buy whatever they like at the spawn just by selling a bit of wood and stone. It would be better for the iconomy of the players if they were required to go to player owned shops or build their own. If you do have a shop it should be for rare iteams or iteams that are hard to obtain (ender pearls portals, spawners and end world related iteams)
yours sincerely
justlyapanda