Do you really disagree with the p2p model that provides you with good services essentially for free, or are you getting carried away on the bandwagon? The Spotify and Skype EULAs [1,2] both disclose that they will use your bandwidth to provide the service.
The services provided by Skype and Spotify are way more valuable to me than the value of the bandwidth, and I expect this is the same for the overwhelming majority of people.
 http://www.spotify.com/us/legal/end-user-agreement/ (search for "bandwidth")
 http://www.skype.com/intl/en-us/legal/terms/tou/ (also search for "bandwidth").