What is the use of estate agency? Does it help in a way? And why does it becomes more expensive as its time limit becomes lesser?

The homes from the estate agency help you be able to grow berries and make other types of stuffs that you can help you in the game. the time limit is for the berries and other stuffs, the big type of house you owns the less time is takes for the stuffs to grows and the faster you can makes more of the stuffs.