This is a good response to the oft-heard claim "I came up with that two years ago!"
Yes, you may have come up with it two years ago, but the initial germ of an idea is perhaps 5% of the process towards making something you can sell.
I have a friend who is constantly coming up with "great" ideas for apps, and has been bugging me (as someone in the tech world) to help him sell his ideas to companies, where other people would be making his ideas and he'd just be getting cuts of the profits. It's hard to explain why great ideas are literally worthless if you're not actively putting in the weeks and months to make them happen.
(The OP, of course, is a little different as they actually put in a fair bit of legwork.)
PS: I (really) totally came up with Pintrest a year before it existed, and had even spent an hour or so one night coding it! I should be getting a cut of the profits.