Wagering Insecurity: The Rise Of Grey Betting Markets Sponsored by: Jim “Mattress Mack” McIngvale made it clear how important it was, for him and the overall racing industry, to place his massive Kentucky Derby bet on-track at Churchill Downs. He told the Thoroughbred Daily News: “It's crazy that some people in the horse racing business bet with a bookie or go offshore to a place like Costa Rica. They're not supporting racing.” While there are plenty of legal arrangements for betting on U.S. racing, be it through any ADW account, at the track, an OTB outlet, or even for tho...