Ok, so I promise not to say that out loud again....
You didn't really get taken off the plane did you :-|
Really strange and stupid woman. If the Microsoft AntiSpyware software is doing a good job of actually removing the software, why should he bother paying for something?
Would it have been any different if the guy was using Adaware or Spybot Search and Destroy?
Software is produced by people who work very hard to put it together. Those people get to decide under what terms they will allow you to use the software. Some ask for payment in cash, others look for their reward in prestige alone, others even like to develop software as a charitable enterprise, donating that software to the community.
In this case, however, the makers of Morpheus have obviously stated that there are two ways you can pay them back for their software - you can either pay them in cash, or you can pay them by watching the advertising that comes through their software.
Removing the advertising components, and then watching as they come back onto your system, should be a reminder to you that if the software is good enough for you to use, it's good enough for you to agree to the developer's stated payment schedule.
Anything else is dishonest.
I think Susan's concern is more about the risk of having unwanted and unnecessary components on your system, and that can easily be satisfied by paying real money for the software you use, rather than submitting to advertising.
Of course, file sharing with unidentified and unreliable sources is a great way to increase your exposure to other threats, such as viruses and spyware not associated with the p2p software you use.