In my case, it heavily stemmed from our inability to do sales (at all). We had feedback early about how this was an $XXXXX product (and we were in sales process for that) and it put blinders on us. We should've been okay with $XXX and grabbed 5-10 customers early.
Why we couldn't do sales is something I'm not going to put on the internet because it affects people other than me. (I have no issue talking about my shortcomings.)
I left that company and started another with a proven sales/marketing type within 2 months. The story is much different than my first. It's because he can sell.
Funny enough, I have a license to use my old product w/o selling it, so we do. We've gotten at least 10 customers asking to buy it. And they're fairly emphatic about it.