We think the Mac will sell zillions but we didn't build the Mac for anybody else. We built it for ourselves. We were the group of people who were going to judge whether it was great or not. We weren't going to go out and do market research. We just wanted to build the best thing we could build.
What if you gave someone a gift and they neglected to thank you for it - would you be likely to give them another? Life is the same way. In order to attract more of the blessings that life has to offer you must truly appreciate what you already have.