The increase in Purses isn't a product of the take form fixed odds bets. Until recently the bookmakers were paying about 0.3% of their handle as fees. That has increased in the last couple of years but only to about 2%, it is dramatically lower than what pari-mutuel wagering can provide.
The industry income from wagering would be no more and likely less in real terms than what it was 10 years ago. The increase in purses is more a product of inflation and some tax breaks/redistribution.
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