Gree,
It's great that you are offering a unit for gems to increase the maximum number of buildings you can upgrade by 1. However, this really alienates the new players, free players, and newer accounts. With the the high costs of equipment, units, and limited time buildings more than 1 building at a time upgrading is a must. It is nearly impossible to play this game without the ability to grow your economy quicker. Please come up with a way to give those that need additional upgrades the opportunity to get it without real money. I don't mind working for it as long as it is attainable.