Not to mention, the idea wasn't necessarily worthless. It wasn't any worse than, say, Instagram. We only remember it that way because Instagram succeeded and Color failed.
I'm not sure that's true. For angel investors maybe but come VC time most companies already have traction and the VC money is to go from $10m value to $1bn. If the product's bad the founders get wiped out so it's not so helpful.
Good ideas may look good, but good-looking ideas capable of creating huge companies (thus great) are almost certainly tested already, so you are either wrong or late to the game.
Of course, YMMV. Nobody ever agrees on what an idea looks like.
The product I want to build next is a niche product for a very specific (but quite large in absolute) terms demographic, profit per user (after tax/VAT/Hosting minus staff) is approx $6 per month, at 500 users I'd be doubling my current income, at a 1000 I'd be able to work on it full time, at 2000 I'd be very comfortable, anymore than that would just be gravy.
It's not even a difficult build (I've built much more complex projects for clients) but the market doesn't exist at all (which means it's either a really good idea (unlikely) or a terrible idea (more likely)).
In either case I'm gonna give it a shot since it's a product I'd have bought if it existed immediately and happily.
The good bizarre ones could wipe out an existing industry. That's what makes them interesting.
In a world where people like Dixon advocate having ideas that "look stupid"[1], it's no surprise that even the ones who don't want to cash out but genuinely want to build something useful follow the stupid path.
Because, let's face it, for any startup with VC money plans, the primary goal is not building a good product, but convincing VCs they're building a good product. The appearance of a good product is more important than the reality of a good product.
[1] http://www.businessinsider.com/the-secret-is-to-have-a-stupi...