If you can consistantly win online you could make a living live.
You need to have 20BI and a liferoll but its possible. So if you wanna eek a living out of 1/2 youd need 4k and then money to fall back on outside of poker, maybe another 10-20k.
It is a very poisonous structure to put yourself in to play a recreational lucrative hobby as a job/life. The cash games are revenue based/percentages based/ high-frequency rake. On top of that the edge in NLH is like non-existent now a days. The game is extremely stressful if bad variance comes your way it will ruin your mood for life, your income your livelihood and basically your Psyche will be dependent on a game with like no edge and notoriously wicked variance.
If you are a marketable pro it is a good idea but if you are not you have terrible odds to compete against on top of that you have to play self employment tax, gambling income tax bracket etc. expenses. I suspect it is a type of hell more stressful than business stock trading.
I think it may be difficult at the beginning, but it is not impossible at all. It must be a good player. Who want to live from this, want to be the best. or vice versa? I think the latter. I think live poker can be simpler due to rich hobby players.
If you can get good enough to do the whole crowdfunding staking thing, I'd imagine it gets a lot easier/less stressful. But that's a prohibitively difficult level to reach.
I think it is very difficult to live only from poker, I think that for this the person has to have a good heritage, to be a very good player or to have a good sponsor.
I live in venezuela and game nl5 and nl10 and as our currency is very devalued with respect to the dollar pffff I earn about 100 salaries that a regular worker in my country would earn
There are many examples of successful cache players and tournament players, but this requires a strong character and willpower to learn and play for hours.