I heard lots of stories online that there are people who are making a living in sports betting, and honestly it really inspires me that's why I'm still gambling now.
I know someone that did this full time, this person has been gambling from when I knew him up till this day. We were college mates, this person used sport betting to handle all his college expenses back then and up till this day he's still very active in on the gambling business although he has other job now that he used to take care of others bills.
Currently him betting is just a way to support himself but before now he relyed fully on just betting. I knew this because I was with him like most times although we weren't best friends but just friends. He didn't have a hide time since he was very good with his predictions and sometimes we copy his bet and win too.
Your friend is truly a lucky man to be able to make money on sports betting and has been doing it ever since. Only a few people can do like your friend because most will experience many losses, making it unfit to do it continuously.
But your friend can do it and he also allows you and other friends to win. But he didn't have to do it all his life; luckily, he now has another job that can provide him with income. Maybe he also felt gambling was not a good way to make money.