there are people like that . take profesional gamblers as a basis , have you try reading thier story? you should check if not and you will see that they also spend much time before they master a talent like that .
with fifteen years of experience op can be a master now and masters aint playing small money so he also loose alot of money on the process . he have the guts to continue so it means that he didnt mind the money that he burned
If people can think about doing that thing will be worth it for his life or not, I think he can have objective thinking that not all people can spend almost his entire life to learn to be a pro gambler. It is difficult to learn to be a master in gambling, and we don't know how much money will be used to become a master. Fifteen years is not a short time, and I am sure that there will be a hard time for that person to continue learning to gamble.
I know some people who have been gambling for a long time. Gambling for 15 years is not unrealistic, you will find many examples like this all around you. Gambling for a long time is nothing special, the point here is to see how much you have won and how much you have lost. Those who come to gamble and think of increasing their fund quickly lose their capital, I have seen many people who have lost everything by gambling. Again, many people have made good profits by gambling in the right way and using their talents. So there is nothing impossible here.
I agree that there is nothing impossible to do that, but many people are trying to be a master in gambling, but they can not succeed in being what they want. Many of them become crazy and obsess to be a master without thinking about what they should do with right. I only know some people who gamble for a long time, but they stop before ten years they gamble. Mostly, their reason to stop gambling is that they feel saturated with what they did. They just learn and learn while they don't even think about their family. In this case, the mistake comes from them because they are only learning without doing anything. But we can not judge them to manage their focus to learn to gamble because we are not in their position.
Eventually in long term if someone is playing just to make money most likely will be in loss itself. Because in longer times when you continue gambling the losing streaks increases than making profits. There could be exception though and for the ones who gamble occasionally or just to have some sort of entertainment those we can consider that they could be gambling more than a decade. But ones who are always regular and gambling for so long would be less in numbers for sure.
Most people who gamble will lose their money in the long term, but some people can make money from gambling. That people can win many times on gambling games, and people will see that is the example of people who can use gambling with the right. Maybe other people will learn from them, especially learning about how they can do that, and how they can deal with the risk and losing the money. The exception will come to people who can control themselves in gambling, while the other will not get that exception.