As I see it, we should consider it as leisure money, spending money, which you hope for a positive experience but which does not have to turn out that way. You can go to the cinema or the theatre, and the money you pay for the ticket is spent, you write it off. The experience with the film or the performance can be very good, or bad.
In the same way you can deposit money in Betfury, but if you don't do it with the mentality of writing it off, you've screwed up. In the same way, you can have a very good experience, and win a good jackpot, or a bad one, and lose your deposit.
Although it is true that you learn this after a while, the first few times you bet you are just looking for luck without really understanding what it is all about and many people, especially newbies, think they can get rich betting.
I know some people make money in casinos, specially sportsbet. But i never did.
Recently i discovered that i could make some bucks by joining all contests in games and round board, then get my wins and wager them in casinos.
I have been able to make a few money with it, and it is fun. I love when I see that I have won a contest of guessing prices or goals or yellow cards. I miss betfury in those games.