very cool simluation, very ambitious and detailed, still don't feel like i understand it all. as others said, the online persistent idea is very fun. i think it might encourage players to check back every day if somehow you had like a # of actions you could do per day and then come back the next day and see what kinda of results and resources you now had to play with.
i also think a smaller map would be interesting, so you'd have to compete for the land. does the prxomity of farm to housing get factored in somehow or is the land value mostly from just the absolute number of plots being limited?