I have hundreds of programs that I have paid for over the years and do a pretty good job in keeping them updated. But as time have changed and software authors are looking to increase there bottom line you may be in for a surprise but there may be software that you have paid for that is spying on your every move. Can you imagine paying hard earned cash to support the author to have them at a later date during a upgrade add spyware to the product you legally own.
Many times we do not read the fine print of the initial/upgrade software license and they legally install the spyware. I personally think the practice is borderline criminal. But you should check out this list that has programs listed that contain spyware. The list is rather long.