Not sure which way you're trying to get this question answered, but:
* If you're asking for "why do the limits exist", I think they claim it's to protect the players from losing all their money on single bets; protecting the gamblers.
* If you're asking "why is the Indian Casino limit higher", it's because the politicians get more $$$ from the Indian Casinos.
See WSGC information on the pilot project for upping the limit to $100:
Quote:
Card rooms in the pilot program must collect and submit the following information to us each month:
• Dates, times, and number of tables operating under the pilot program.
• Number of players at pilot program tables every hour the games are operated.
• Wager limits offered at pilot program games.
• Daily food and beverage sales.
• Number of customers requesting to be self-barred.
• Number of suspected cheating cases on pilot program poker tables.
A final report will be presented by staff at the May 2012 Commission meeting. The Commission will evaluate the data collected in the report and use it to determine whether the wager increase should be made permanent.