Most of my betting action is done using my betting broker Sportmarket Pro but I also use 2 BTC Bookies (Nitrogensports & sportsbet.io) I'm also using Betscorum which is a crypto project with a 0% fee betting exchange running on the same code as Steem. If you ever want to tets betscorum out give me a shout and I'll send you some SCR after you got an account.
I'm using my main steemit blog for betting purpose by the way. (https://steemit.com/@costanza)
I've been a sports bettor for many many years and still absolutely love it. I've always seen it as some kind of intellectual challenge