Ideas are a dime a dozen. It's the execution that matters. Show investors traction, growth, or profit — if you can't reach any of those milestones, rinse and repeat until you do — now you're ready to talk to investors, but wait, now you've reached a point where you don't need investors anymore. I actively avoid entrepreneurs that are looking for an investment as a form of business validation. An entrepreneurs job is…
Bad ideas are a dime a dozen. Ideas that are good and early on have solid evidence that they are good are rare.
Here are some ideas that, just as ideas, should be valuable to VCs:
(1) An algorithm that shows that P = NP and is fast. Why? Because it could commonly save 5-15% of costs in transportation, logistics, Internet backbone design, manufacturing, and allocation of resources more generally.
(2) A computer operating system that is nearly 100% compatible with Windows and can run any software safely, even malware.
(3) An algorithm that can implement the fundamental theorem of arithmetic, that is, factor integers of thousands of digits into a product of prime numbers quickly.
> but wait, now you've reached a point where you don't need investors anymore.
Not exactly true in all cases, but there is a major point here. E.g., recently I added the cost of high quality parts for a server in a mid-tower case -- 8 core processor at 4.0 GHz, 32 GB of ECC main memory, 10+ TB of hard disk -- ~$1500. Can get a wire rack shelf unit from Sam's Club, 18" x 48" x 72", and could put about 12 of those servers on a rack. That's a LOT of computing. If have a Web site that can keep that computing busy and send with the Web pages ads at, net, $2 per 1000 ads sent, can support a family in style:
Suppose can send a Web page for 400,000 bits, have 4 ads per page, half fill upload bandwidth of 15 Mbps 24 x 7, and get paid $2 per 1000 ads displayed. Then get monthly revenue of
2 * 4 * 15 * 106 * 3600 * 24 * 30 / ( 2 * 400,000 * 1000 ) = 388,800
dollars. A year of that and have as cash as much as many series A equity rounds.