https://www.bloodhorse.com/horse-rac...tting-services
From the 2012 BloodHorse article:
Interesting statistics came out of the forum. Roughly $2 billion a year, or just less than 20% of total pari-mutuel handle, is said to come from high-volume shops. One of them—Elite Turf Club, which has only 11 customers—accounts for 10% of handle nationwide each year.
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As I recall, RGS and Elite Turf Club do not use Oregon as their wagering hub, but LVDC (Las Vegas Dissemination Company) instead. It would appear that Elite clients average around $100M each.