I kept telling myself that I should pay for Evernote since I use it so much, even though I don't really feel the value-add of premium features matches the premium cost. When I ordered the Evernote bag, there were some fulfillment issues, and Evernote gave me some credit that I could use toward a subscription. When I redeemed the credit, it said it would extend my existing subscription, so it turned out that at some point in the past, I actually had decided to pay for it.

I guess I look at it like a Wikipedia donation. Paying doesn't really get me any must-have functionality, but it does feel good helping them keep the lights on, since I have the disposable income to make a payment.