Both excellent questions. Oddly the tire kicker never says "If you build X then I'll buy it .. unless my needs change or someone else releases a superior product". Requesting a purchase order casts the situation in the cold light of day.

> If not, what happens if someone else releases a superior product in the interim?

They'll get your business.

> Or my business needs change?

I didn't waste my time building you a feature you won't pay for.