Usually it's hunger and restlessness. I'm pretty sure most of my disposable income is disposed of on food, drink and travel. I don't aspire to own vast amounts of stuff, quite the opposite.
I don't think I have actually. I signed up after a friend showed me the service. I also know about them from reading tech sites over the years, it was big news on places like slashdot when services like this started up.
Prime I use because it's free right now, though I'll probably cancel it at the end of the month because I don't like it that much. NowTv I subscribe to because it turned out to be the easiest way to get GoT when I decided I probably shouldn't pirate any more. I found out about it because I searched, not because someone intruded into my life and demanded my attention.