The pool of people you care about is going to shift over time.

The other mistake I think people make is talking to who's available rather than talking to who they need to talk to.

People don't like silence, so they'll keep talking to fill the void.

If you just talk to who's easy to talk to, you're not really getting the best data.

That's actually one of the most disappointing things about doing user interviews and user feedback, which is why I think... people don't do it. You're going to get negative news about your favorite pet feature most of the time.

Sales is this cure all for this problem. Get people to give you their credit card and I guarantee you they're actually interested.

Most startups are not just built for the person who is using them. When you do that, every now and then you get really lucky and... are representative of some huge class of people who all want the same thing you do... but very often that just turns into a side project that doesn't go anywhere.