You cannot be wrong if you understand gambling as a way of making money as that can be our purpose to gamble. It is our own money so we have the freedom to do what we want to do as long as we are responsible enough to accept the possible loses because gambling is all about winning and losing and more on losing.
Lossing and more lossing on doing gambling is just a normal thing thats why we should be aware on the things might happen or result on the long run when we intend to play gambling. This is not actually wrong on playing gambling as long we dont compromise our money too much and we really should have self control on playing this games.
Well yes there are people who are really having fun in terms of gambling but I think most of they are also addicted to gambling and I think if you would sink in most of your time in gambling there are a bigger chance in getting addicted with it too, so in my assumption you should think first in thinking gambling for just fun and making profit out of it, you just think about gambling as a time killer only!