iTunes store gives you a few seconds sample of a song. I’m sure most people would rather hear the whole song from beginning to end before deciding to buy it. If you only hear a few seconds of a song, you could easily make a few mistakes. A mistake would be deciding to buy a song, as well as deciding not to buy it.
When Spotify allow me to buy songs directly from them, there’s a good chance I’ll be doing this. As much as a like Apple, I don’t think it will be healthy for them to get a monopoly on the online music business.
My music tastes range over many genres. In one day, I could be listening to classical, techno, folk, rock, pop, anything that takes my fancy really. I’m starting to build up playlist, and discovering new music in the process.