A one-time purchase business can still build a valuable audience if it gives people a reason to stay connected. A wedding planner, for example, may have clients who never need the service again, but those same people refer friends, share posts, and build credibility for the brand. The audience becomes a marketing tool even if most of them will never buy again. Sharing useful content related to the topic also keeps people engaged long after the sale. Do you think referral traffic from a one-time buyer is more valuable than people give it credit for?