Sounds like a wise financial decision if it pays for itself in four months.
Our experience has been opposite with rural internet. They charge you up front for all the equipment. Receiver dish, installation, modem etc. Usually runs about $300. Then you pay monthly. I guess this way they have no skin in the game if you stop paying. Not sure why else they would have a monthly payment option. I think for city folk it is similar to what you are describing.