I think this is how a lot of enterprise software is sold. Potential customer says "it's missing x", sales person says "we'll build x in two weeks", product is sold, devs have to figure out how to build x in two weeks.

That probably doesn't work for physical products.

Are you going to build it instantly?

If not, what happens if someone else releases a superior product in the interim? Or my business needs change?

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.