I'm always relieved when some controversy has blown over by the time I hear about it. - Paul Graham

It may seem unlikely in principle that one individual could really generate so much more wealth than another. The key to this mystery is to revisit that question, are they really worth 100 of us? Would a basketball team trade one of their players for 100 random people? What would Apple’s next product look like if you replaced Steve Jobs with a committee of 100 random people?6 These things don’t scale linearly. Perhaps the CEO or the professional athlete has only ten times (whatever that means) the skill and determination of an ordinary person. But it makes all the difference that it’s concentrated in one individual.

Use difficulty as a guide not just in selecting the overall aim of your company, but also at decision points along the way. At Via web one of our rules of thumb was run upstairs. Suppose you are a little, nimble guy being chased by a big, fat, bully. You open a door and find yourself in a staircase. Do you go up or down? I say up. The bully can probably run downstairs as fast as you can. Going upstairs his bulk will be more of a disadvantage. Running upstairs is hard for you but even harder for him. What this meant in practice was that we deliberately sought hard problems. If there were two features we could add to our software, both equally valuable in proportion to their difficulty, we’d always take the harder one. Not just because it was more valuable, but because it was harder. We delighted in forcing bigger, slower competitors to follow us over difficult ground. Like guerillas, startups prefer the difficult terrain of the mountains, where the troops of the central government can’t follow. I can remember times when we were just exhausted after wrestling all day with some horrible technical problem. And I’d be delighted, because something that was hard for us would be impossible for our competitors.

It's a mistake to treat investors' reasons for rejecting you as a guide to what you need to focus on, for three separate reasons: (a) much of the time they're lying, (b) when they're not, they're often mistaken, and (c) fundraising is not the primary goal anyway.