Soifyouend upaddinglikeabunchofnewfeatures in what you say simply a revisionof an existingapplication, your existing userbasegetsall of that new functionalityfor no money.
It also worked out pretty well for the state of South Dakota who added some large businesses to their tax base while creating a bunch of decent paying jobs.
In the midst of canyon country, Robbers Roost, near the town of Green River, was both a hideout and base for Butch Cassidy, leader of the Wild Bunch Gang, a thieving group infamous for its train and bank robberies.