Mobimatic is very simple to use "Drag & Drop" with a lot of templates that you can use for create apps fastly. As you know, nowaday people are using smartphone everywhere. That why all businesses want to have their own mobile apps to promote their services/products.
Simply, I did googling to find some local businesses, contact and offer them with my demo app. There are no exacted formulas how much you can sell per app. It can be from several hundres to some thousand dollars.