I don't think a trader is defined by his motivation. I think he is defined by the way he plays the game.
My play size is primarily controlled by the size of my account. When I break those size rules, I always regret it. By keeping my size in perspective with my account, I am able to avoid losses. I am currently not dependent on the market, but now supplementing my other income nicely. My goal is to eventually be market dependent. As with my play size, that will depend on the size of my account.
I struggled greatly with the PDT min as I am an equities trader only, but have recently pulled away from that. I had to stay small to overcome that, but it can be done if the size rules are followed. Pikers are mocked (hopefully they are not deterred by that if they are trully trying to excel), but unless you have a big chunk of change, you have to start small, which is the biggest challenge. Hard to get over cost playing small. For me, scared money wasn't money I needed to live on, but staying above 25k. Broke size rules more often in the 25k-27k range , even though the consequences were higher. I finally took the old quote to heart: "The trader who succeeds is the trader who's tolerance for his bad habits runs out before his money does". My bad habit was breaking size rules, often by averaging in. Still have days where I break rules. Missed a great move Thu by not following my entry rules.
My plays are strictly based on charts with nothing more than FTP's, volume, and 20, 200 ma's. I play only one pattern, regardless of the time frame. Whether it is gap play, pull back to trend, or climactic play, I need that pattern within a larger setup or I won't enter. If I don't follow this rule (like Thu), I am gambling.
Everyone has different systems. I think one's edge isn't a particular system so much as how one implements and sticks to his system. Not so much why, but how one trades is what defines a real trader.