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Let's see...1900 max for the first three prepares, 1500 each for the next 5. Most facilities follow a basic 300->600->1000 upgrade system, so a decent estimate, assuming no repeat facilities, would be 70200.
Good idea: giving the kender a shiny coin for disabling the trapped hall. Bad idea: showing the kender a shiny coin and tossing it down the trapped hall.