I was thinking a lot about this. I think sport bet is more risky because 95% on dice means 95%, and there are lots of factors that will effect on sport game such as injuries, weather, fans, bad day etc, not to mention bookie can make mistake.
Same here but we can't have same level of excitement on playing casino like we have when betting on sports which we love to watch and support favorite team. I bet on sports to have that excitement rather than to earn some profit out of sports betting.