A possible 3rd scenario is, you meet and make a presentation, BigSearch asks some pointed questions and immediately reverse engineers it to produce a 1-off copy, while giving no remuneration.
Sure. Though they would still give me the satisfaction of knowing that their product was brought into being by my work. Which is to say, better still than letting what I have rot away in a drawer until someone else comes along and builds an identical thing two years from now. That being said, getting some part of the profits also would be even nicer.