If he expanded the service areas to 2-4 hours around Bozeman, you'd be surprised. But, even if the campaign only came back with 7,000 potential email address, with a 2-3% open rate that gives me him a pretty good new customer pool. He could run a initial blast + redeploys for around $1500-$2000 or so. With ~150 opens that are then retargeted, filtered than down to 75 people. If he got 5-10 new customers out of that + another ~2 spinoff referrals, that's a pretty amazing ROI. However, even if he just ended up yielding 3-5 new customers, it would still be worth it.
OP, I attended an annual fundraiser as a guest. It was for the local adaptive sports foundation, but this could apply to any fundraiser that attracts wealth. One of the acuationed items was a private chef experience for a party of 4. I seem to recall that this service auctioned in the neighborhood of $10,000-$12,000 (money going to the cause). You might look into donating your services for a similar type of fundraiser -you could even look into the Ducks Unlimited banquet or comparable. That puts you in a room full wealth and potentially doing a dinner for extreme wealth and while it would cost you (though, you may be able to negotiate your costs into the equation), it demonstrates your level of service to some highly influential people. An old friend of mine was the sous chef on a small, private event for a billionaire family and they liked him so much that he got a call the next day and was hired as the families private chef. He now travels around the world with them on private jets, is on salary with health care and PTO and the family are even paying for my friend's son to go to the private school the billionaire's family all went to. While I suppose that's about like getting struck by lightning, it shows the value of networking in this industry as well as the potential value of any new customer in your client base.
