I played a lot in college, but never really got "good" per se. We had a group of about 20 or so of us who played semi-regularly. There were two players who were both far superior to everyone else, but they didn't always win. Just like everyone else, they naturally suffered the turmoil of a bad beat here and there. But aggregate their winnings over the course of the two years we all played together, they came out far ahead of everyone else.
And I think that's probably the main point here. These two knew how to grind out the bad beats and come out on top over a long enough time frame.
I also have a good friend who crabs in Alaska (his dad and him are on the Deadliest catch together) - each season is a "gamble" with how long it will take to catch enough crab to meet quota, but it's not like they're putting money into a slot machine and hoping for the best. There's a system that leads to success. Sometimes they get "lucky" and their season ends quick, others it's more of a lengthened grind.
They seem awfully similar.