Benefits is that you can easily while your time, you can get many beverages to eat in casinos, if you win then it is bonus as you everything else you are getting is free and do not have to spend and above that if you win is like you are the luckiest of them all as mostly people will lose money. Also you can make some good buddies as well.
Well, regarding gaining new friends, that is possible but the caliber of friends you are gaining depends on the casino you are going to as you would not really be making ,much of reasonable friends from a local casino anyway except may be for that period you will always be going to gamble.
With respect to getting everything for free, I have never experienced that though, even though I usually do not gamble much or ask for anything but I doubt if that is the case. A true benefit from gambling is stress bursting. But most gamblers do get stress due to gambling. Instead of finding some benefits from gambling, those people do lose more to gambling.