A great Scuba customer for a retail shop may buy $25k over their lifetime A big shop may have 100 of those. By far, a shop sells 1000 sets of Mask, Fin, and Snorkels a year to folks going on holiday to the beach. Not to great customers, but to the bread and butter keep the shop open folks.
The markup on travel is tiny, maybe 10% and a busman's holiday. Lots of travel is sold, which means the owner has to hire someone to watch the shop while they are out working the trip.
I spent $15k to go to DEMA. Enough of the consumer types get in that I had to have 2 booth attendants to talk to them. Those conversations were typically short, as we gave nothing away at DEMA. My time was better spent talking to the person booking a whole boat at $50,000, because it took the exact same amount of work as it did to talk to the retail customer (who wanted to know if we would give him a trip for free, "for the exposure") who would spend no more than $3k for the week.
So no. I don't care about the small buyer who might become a big buyer. I wasn't there to sell to small buyers or big buyers, I was there to train and sell to the wholesale buyer.
EDIT: You understand that DEMA is Travel, Trinkets, and Training, right? The gear sales are done in house by a traveling rep. A consumer might see the newest full face snorkel in the new products pavilion, and might clean up the floor displays the last day of the show so the vendor doesn't have to ship it home, and may make enough for beer money. But there is nothing there for a consumer to buy, and the punters take time away from the manufacturers who are training sales staff and instructors to sell their trinkets.