I would still play poker, but purely as a hobby. If I won $50 million, I would already have more than enough money for myself and future generations of my family, so playing poker for the money would lose most of its meaning. I would probably play even more relaxed, without worrying about losing a buy-in or feeling that I needed to make a profit. I could focus more on the game itself, improving my skills, making good decisions, and enjoying the competition. The financial incentive would no longer be the main motivation. What would keep me playing would be the challenge, the strategy, the psychology, and the excitement of competing against other players. I think poker would actually become more enjoyable when I didn't need the money from it.