A quick think on this one and TBH, no betting websites charge you to place a bet and any actual bets as in stakes are free games with no cash prize.
Another way of looking at it is if like when bookies offer deposit £25 and they match it, something like that.
free betting = 3600 exacts globally, this includes America where they can't legally bet online.
Summary : it's a .com with low term results and it's hyphenated, can be difficult selling hyphenated domains, with hyphens you would be looking at reseller £20 end user £100