CIV level Tax Gold
--------- --------
wilderness 50
civ 1 200
civ 2 250
civ 3 300
civ 4 350
civ 5 400
civ 6 450
assuming 10 soldiers for a wilderness seems plenty (who is going to spend
mor than 20 to get 50? But at civ 1, even 50 soldiers returns 100 gold
net profit--at no time cost to the noble owning it