The opportunity for making money is always there with on-line Poker, How much you make is down to you!
How good you are at playing Poker?
How much time you have to invest in Poker?
How many tables can you juggle?
It is all relative to what you want from the game? Personally I play for fun, I can multi table up to a certain amount of games but do I want to? No! Once you start to multi table it becomes a form of Work and the game loses it's appeal, If I wanted to work hard I would find a Job with a guaranteed wage at the end of the Week/Month, It's not always about the money.
I can play on many Poker platforms that offer no money games and all you are playing for is a chance to increase award points to level up your on-line character, Losing your Bankroll is just inconvenient and you have to start from scratch
I also made a living off Horse Racing bets when I was younger, but like any form of gambling it is a rollercoaster ride, with more down swings than up swings, so I gave it up, Learning my lesson at an early age I can now play Poker and gamble a little without it causing any problems.
Moderation is the key when it comes to any form of gambling and Poker is just that, Gambling!