This is $10,000 value advice for those thinking of launching a web startup, by the founder of WePay:
(…) Sometimes you can’t PAY somebody to use your product, let alone get them to pay you for it. It’s probably good to know that before you decide to quit your day job.
(…) If these recommendations are too extreme, treat them as a thought experiment. Just don’t lie to yourself.
A quick (but BIG) caveat: there are VERY notable counter-examples. I think they generally fall into three categories:
Products that solve a problem that people don’t know they have (or one that they can’t articulate), but offer a solution that is so compelling and elegant that it can overcome this obstacle: Dropbox.