Worse, let's say that you do this for two years. At the end of that two years what skills have you acquired? The ability to play poker. Basically that's it. There might be some tangential skills like reading people, staying calm under pressure, etc. — but, basically you have learned to play cards well.
If you spend that two years starting a business, trying out new product/service ideas, testing the markets, programming a website/service/app you are learning skills along the way that can help you down the road. Even if you completely fall on your face and every idea you have is a bust, you have some skills that will help you with your next business venture or (god forbid) getting a job. If you play poker for two years you have none of that.
If I had to choose between the two I'd pick the business route for the reasons you've listed. But relying on one or the other to work out and pay your bills is "crazy"
His poker argument actually started there, and I think this was the more important point. It's stuff like reading people, staying calm under pressure, evaluating probabilities, recognizing the important factors out of hundreds, and making good decisions that make poker valuable even if you don't make it into a career.
The point about making it into a career was, IMO, a distraction from the more important point about the life skills acquired from learning the game.
13rules' comment got me rather nostalgic about the kind of content and comments we used to see around here. And before anyone nitpicks, this account is only ~3 years old, but I had another for two years prior.
Anyway, I welcome comments like 13rules'.
How is that any easier or reliable?