Not sure if this is what you were looking for, but I found it to be a great read. *Update, added another article*
1)
http://www.yale.edu/tri/pdfs/bulletin2005/042Bull05-Quiros.pdf2)
http://www.panda.org/about_wwf/what_we_do/marine/news/index.cfm?uNewsID=235343-)
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T6N-4MC12HB-8&_user=10&_coverDate=03%2F31%2F2007&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=1d5bf50a81c3391a9ab75933c2aa4935This is a comprehensive list of Whale Shark Dive Sites.
1-)
http://www.divedarwin.net/ (Galapagos Islands, From August-September, preferred dive site is Darwin's Arch, Could not find anything mentioning cost)
2-)
http://www.cevichetours.com/ (Isla Mujeres, Mexico, From May to September, Peak season is June - September,Cost is 125.00 American Dollars for a one day trip.)
3-)
http://www.sdsharkdiving.com/Trips/HOLBOX/holbox_07.html(Sandiego Dive Website that takes a trip to Holobox Mexico, Specific Trip is July 3-7 2008, Cost is 1500.00 American Dollars includes minus airfare.)
4-)
Whale Shark Dive Experiences-
1-)
http://www.infiltec.com/oki-0902/ (October 2002, Yomitan Village, Okinawa, Cost is 115.00 American Dollars for about 35 minutes, one male and one female kept in an enclosure.)
Whale Shark Dive Trip Report.
1-)
http://www.sharkdivermag.com/newsletter-august-06.html (Late July 2006, Holobox Mexico, Could not find costs, estimated 100 whale sharks seen over 9 day trip, but does not mention if they identified 100 different sharks.)
Whale Sharks Found in Captivity-
1-)Izumito Sea Paradise Aquarium (1934, first known estimated to be kept for 122days.
2-)Okinawa Churaumi Aquarium, Japan. From 1980 to 1998, 16 whale sharks (14 males; 2 females)
3-)Georgia Aquarium (2005-Present.)
Other Whale Shark Tourism information-
1-) "Today, more than 7,000 tourists come to Donsol each year to interact with the giant sharks." (SRI,
http://www.sharks.org/expeditions.htm, Under the 2008 Border, click on more info to download the pdf.)
This is just some information I was able to find. I do plan on going back later and performing a more detailed search. Going to see if I can find actual numbers for you.
-Some of the articles can be lengthy. If you need me to pull out specifics from the article just let me know.
My Best,
Ashton
agrifsb@gmail.com