Yep yep. Back then, if you had more than 35-40 men, pretty much everyone thought you were living way beyond your mean,s or had a rich benefactor. (Unless you were a region lord, which was usually <10% of the realm.)
It would be interesting to see what would happen if an island returned to that state. I can only imagine how many people would be complaining about the lack of gold!
Really, though, the carrying capacity of the island is dependent on the number of available estates that provide acceptable incomes. There were some rumblings that maybe the minimum estate sizes would be changed, either to lower the size in cities, or perhaps to even base it on a minimum number of peasants per estate. *pokes Anaris*