I would like to know why people are trusting their luck more in sports gambling compared to other type of games.
Personally, I put bigger bet on sports because I believe I have a little skills that would give me a better chance of winning, but I'm not really serious with sports gambling.
You have already said it yourself that you're also into sports betting, so whatever that makes you like sports betting can be the same for others that are also into it as well. Everyone's choice differs, don't be surprised if there are more people into casino than sports betting.
Sports betting is good and there are some features that makes it better than a casino. There's unlimited potential for making money from sports betting, where as in casino your chances of winning becomes slim on the long run as the odds are placed in favor of the casino