Your points are valid, but I think the percentage of inexperienced Windows users far outnumbers the users with 'expertise'. Those type of people

1. Do appreciate applications that "just work" and are willing to spend time choosing the right apps that suits them.

2. Haven't learnt of BT yet or even if they have, they're willing to pay to save the hassle of checking for viruses, trojans etc.

3. Do appreciate user friendly applications, they'll choose a better looking application with lesser features over a featureful app with bad UI.

Going after this crowd can be lucrative indeed, just ask patio11 ;)