Vertical Markets

When dealing with business owners or professionals, in addition to re-monetizing a segment of their customer or client base, they also have competitors in their vertical market they can monetize... and their competitor's customers.

This is how we define a vertical market: people who market to their industry peers, who then, in turn, market to their industry peers... chiropractors marketing to chiropractors, gym owners marketing to gym owners, dentists marketing to dentists... all of whom have "street cred" given their perceived similarity.

Therefore, if one (of any category) is interested, then it would follow that there may be others (in that category) who could also benefit through their involvement.

No need to beat this topic to death. Simply keep in mind that when speaking to anyone with an existing customer or client base... the idea or re-monetizing people they already are doing business with, or with whom they inherently have credibility due to their shared business or profession interests can be a "natural" extension of what they currently do to generate revenue.