OK, tonight he explained it in a little more detail, before he rushed off to Bellagio to pay a fortune to enter a WPT tournament. He used League of Legends as an example and said that there is a lot of money in LoL ($1 million dollars for a winning team, for example) but unless you are in the top 100 LoL players in the world then you are unlikely to make much money out of LoL. Poker is different.
Firstly there are a lot of different games that you can play (Hold'Em, Stud, Omaha etc.) and different formats (limit, no limit, cash games, SNGs, MTTs, turbo, hyper turbo etc) whereas there is only one form of competitive LoL, so what you can do in poker is pick what suits you best.
The other thing is that if you are stuck somewhere out in the middle of nowhere, especially if you are in a state with no online poker, your choices may be very limited. However, if you happen to be in a big city and you are a friendly, sociable, cheerful type of person that makes friends easily then there are probably various home games around and there are plenty of businessmen that like playing poker and don't really care how much they lose, they play poker just for the fun of it. If you can get into games like that then it is worth studying poker theory and improving your game, because you don't have to be a brilliant poker player in that sort of situation to make a lot of money.
He said that when you see people such as Isildur1 that are doing things "the proper way" and think how amazing the guy is, you need to remember that there are people that are actually making more money but aren't as good a player, they just found the right places to play.