Wow, that is pretty wild to upgrade a few lands all the way and keep others really low. I was going to do the math and see if that was more beneficial but never got to it.

One theory is: upgrade everything to 8, then bring one of each lands to 10. This lets you get the "bonus buildings" - Sawmill, Brickyard <?>, Iron Foundry, and Grain Mill. These buildings give you 5% bonus production per level, up to 25%. And they're CHEAP! Very much worth it.

Good luck everyone on S2. So there are already 18900+ people on a server that's 3 days old?! That's way too intense for me, I'll stick to S6. Fight hard!!!