Yeah, Its a lot harder to rank up to higher levels by placing bets on the sportsbook only. I'm not saying it's not possible but that it takes a lot longer to reach those levels. It's even harder to compete in those wager competitions since you've to wait 90 minutes for your sports bets to settle and then a while longer to get another event that you can bet on (sometimes a week plus) while these casino games are always open. But there's no point moving over. Just keep at it. You'll get there just that it'll take longer.
Unless you're like one of those guys who only places live. I've done it before and betting on a 90 minute match, several outcomes, like scores every 10 mins, next to score, next corner, next card, all those can be really exciting and accumulate a large wager if your initial bet's big like most sports betters anyway:) Of course, doesn't change that it takes longer in general.
As there are many options during live events, and if you know how to managed your fund then it's really possible to make a good wager,
though unlike with those casino gamblers where they really spent seconds to earned more wagers than sports gamblers but again it's really possible to do it.
Better to find enjoyment than try to rush things out and lose more along the way.
In any way, casinos does this to make a profit, so you cannot blame them... but it should be designed to give the sardines a bigger chance to win something too. 
