Great post on The Art of Nonconformity about Jim Collins and the work that he did on Good to Great, which has becomes somewhat of a Bible in the corporate world.
How much would someone have to pay you to stop what you are doing? Interesting way of assessing how much you love it. This isn't about the actual market value of what you are doing. It is about your value. If it is low, should you be doing something else?
Or, in the words of one of the commenters, “What can I create that I wouldn’t accept 100 million dollars to walk away from?”