1. It is a bit unclear to me when I would use Haystack. The main advantage seems to be cost cutting. It would be nice to see some realized examples of this.
2. When competing for price, you may look like the cheap, and thereby untrusted alternative. There is a risky business paradox here, for which I am sure a fellow HN poster will supply the name: you charge less, therefore you make less, and you will not be able to sustain the service, making me not want to spend money.
3. Have you tried looking for companies that may actually need this solution? Have you tried contacting them directly?