The title said it already, some people argue that they are just gambling for fun and that they don't gambling because they want to make money from gambling but sometimes people that makes such kinds of statement still get addicted to gambling. Is it normal?
No it is not normal. If you are gambling for fun then you have no business getting addicted. If it is fun, you just enjoy it and not counting losses or win.
Is it that people are just pretending to be gambling for fun meanwhile everybody (all gamblere) are actually gambling for financial gains.
That is what it is. Some friends gamble heavily behind your back but in your presence they only stake very little so that you don't see them as irresponsible gamblers. They pretend it is just for the fun but you catch them always rechecking their failed gambling ticket and gnashing their teeth.
Those who claim to gamble for fun are not sincere to themselves especially in football betting. Football betting is not just for the pleasure of the game or supporting your team but it is for financial gains.