I don't think your 8% number for win is far off Poindexter. Although it's not pari-mutuel, and it's not in North America, Australia with exchange betting has experimented over the last several years. The industry - as is often the case felt they were not getting enough of a share for purses so they raised rates on exchange win betting in Victoria. Two years later revenue was down and they allowed rates to come back down.
The tax on win wagers of this form is now about 8%. It's where the industry receives the most revenue.
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