I don't see any advantage of the gambling. All of my friends joined and played gambling, but all of them are loss. At the first when play gambling, the profit is high but then is always lose and lose. So that I think gambling is a waste of time and not an advantage, the disadvantage of this is more than the advantage. A lot of families is broken up due to this game.
OP is asking about the advantages of online gambling over physical gambling. What you have mentioned is the disadvantage of gambling which is valid for both online and in house gambling. People lose much and few win from gambling.
Online gambling has two features which make it better than going to casino to gambling. First is Privacy as no one knows that you are gambling and second is ease of gambling where you can gamble any time 24/7 without any hassle to go physically in casinos.