If they are finding their customers at chamber of conference gatherings (or at least targeting chamber of commerce members), perhaps one could see if businesses

If they are finding their customers at chamber of conference gatherings (or at least targeting chamber of commerce members), perhaps one could see if businesses that see the value in belonging to a chamber of commerce (and the marketing and networking benefits of such) have a higher success rate? And/or perhaps businesses that join chambers tend to have been successful long enough to get over the early failures and are profitable enough to afford the chamber fees. To me, targeting chamber businesses seems like a great way to find an ideal target customer base assuming the thoughts I poised above.