I have a little speech I give candidates about how bad life is going to be at our little company. When you find someone you want to hire, especially if you've been looking for a long time, your brain switches to a mode that says "don't screw this up!" Which is bad, because the thing that's worse than not managing to hire an excellent candidate is hiring an otherwise-excellent candidate who can't handle the company you're running.

It's actually worse to hire someone who is awesome and a deal-breaker culture mismatch than it is to hire someone incompetent. The incompetent you can send on their way. With a real talent, there's hard feelings and reputation hit.