refers to the stock of skills and knowledge embodied in the ability to perform labor
so as to produce economic value
(http://en.wikipedia.org/wiki/Economic_value). It is the skills and knowledge gained by a worker through education and experience.
This is taken straight from wikipedia.
Becoming a professional 1/2 live poker player (if there is such a thing)doesn't create much future economic value for yourself. What if the poker scene takes a dive, because of preferences or even legislation? Or consider the possibility that the skill level of remaining poker players after the burst of popularity is too high for you to sustain livable wages (or casinos start to hike the rake!).
After years of playing poker, you have to find a different job. You're skills are very unique, however they aren't exactly applicable to gaining entry into many professions (and even if the math behind poker is applicable, you are still probably competing against other job candidates that have direct skills and experience in the field). It will be tough and the capital you will have created within yourself will most likely be low at best. I guess you could work at a casino, or try to write a book, but not many people will be willing to buy a book from a person that isn't an expert in their field.
And not to be mean, but if I had to play the percentages, I doubt you will become an expert or win millions playing poker for a living. Of course I would be just as content if you proved me wrong.
I would say a better plan would be to get a stable job and play poker part time for extra income. Take classes or study a subject that will give you a specialized set of skills that are in high demand - this will increase your economic value to the world, lead to higher earnings, and won't burden your friend with having to take care of you financially (I would hate to do this to a friend).
If someday you start making just as much money playing poker as you do at your current job, then it might be worth thinking about playing poker professionally.
Whatever you decide, good luck.