"My understanding is that despite a massive slots subsidy (hundreds of millions of dollars) the Pennsylvania Horse Racing Commission was operating at a deficit - I'm told about $5 million this year.
Rather than allow money from the slots subsidy to be used to fund the Racing Commission, the Pennsylvania horsemen instead lobbied the State Senate and demanded a 10% tax on ADWs and rebate shops."
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In my opinion, this is a very important topic for horseplayers. Read more at the above link.