The incentive to a commercial author is to get the application on the shelf so she can derive income from it; if Version 1 happens to have bugs in it, the bug fixes become a selling point for Version 2.
The commercial authors do not enjoy their work, they just enjoy the money it makes them.
mnli hypothesis: The commercial authors do not enjoy their work, they just enjoy the money it makes them. premise: The incentive to a commercial author is to get the application on the shelf so she can derive income from it; if Version 1 happens to have bugs in it, the bug fixes become a selling point for Version 2.