The use of Properties in different PlayMesh free text-based iPhone RPGs are usually relatively similar, and Heroes III follows many of these traits. The process of investing in Heroes III Properties is very closely related to how you utilize the Heroes III Alliance Members system. A single Heroes III Alliance Member can only control up to three developed properties. This means that you have to maintain a number of Heroes III Alliance Members that is a third the size of your number of developed Heroes III Properties. If you try to build one and you do not have enough Heroes III Alliance Members then you will not be allowed to.
Since Heroes III Properties are the most important focus in the game, and your main source of income, you have to make sure that you keep up on both those purchases and the purchasing of Heroes III Alliance Members. These Alliance Members get more expensive for each one you purchase, which why you will usually use your Heroes III PlayMesh Points on them.