At $6/mo, in two years, you have paid $144.
You can find QB Pro for about $100, and can use it longer than two years.
Have to agree with another post, ... trouble understanding the financial matters of QB, then you need help. It matters not how many doors visited, how much wrenching, or how many hours each season sitting on a ZTR.
From what is posted on LS, there are many good machine operators, wall builders, landscape designers and installers, some of which are lousy business people. Just the way it is... nothing against all the other skills mentioned.