Can you make money playing poker? Yes you can, but unless you're playing for rent money that shouldn't be your motivation. I've been playing for many years with decent cash results (tournaments are another story) but the amount I've won is not important and certainly nothing to write home about.
So then, why do I play? I love the game, it's fun, but what makes it fun for me is the mental challenge of always trying to improve. I spend hours per week, thinking about it, reading about it, watching it. It's a hobby, like painting, or knitting, and like any hobby the results are not as important as the effort.
"It's all about the trying"
- Kyle Chandler as coach Taylor in Friday Night Lights