It is believed that the Taiji Fishery Union (which does the hunting, capturing and killing), sells the dolphins they select to the brokers operating in Taiji for about $8,000 per dolphin. Sale of a dead dolphin for meat nets in the range of hundreds of dollars. So, for the fishermen and their union, a captured dolphin for the display industry is worth roughly ten times as much as a dead dolphin for the meat industry.
That is a massive financial incentive (created by marine park demand for dolphins), both to continue the Taiji dolphin drive hunt as well as to sell as many live display dolphins as possible to Taiji's local dolphin brokers. According to Ceta-Base and Whale and Dolphin Conservation, 247 Taiji dolphins were sold for display in aquariums over the course of the 2012-2013 drive season. Crunching the numbers, that is an estimated $2 million in revenue for the Taiji Fishery Union, plus whatever they brought in through dead dolphin meat sales. And it means a very rough estimate of $7 million-plus in revenues for Taiji's dolphin brokers.