I'm not sure how I feel about how it ended, but I think Chuck kinda imploded the dream of Jimmy the big time lawyer, that job in the other firm was a poisoned chalice the moment that rant left his lips, even if Jimmy had been a success, he'd have gotten in via the back door and not had to earn it in Chuck's eyes. Which is what it was all about in the first place, Jimmy wanted to prove his brother he'd changed/ make him proud, but no matter what he did it wouldn't have mattered to Chuck because, to him, the methodology is as important as the end goal, which Jimmy fundamentally neither agrees with nor understands.
Sure, he'd have gotten the money, the expensive stuff and the status but he wouldn't get the validation from his brother that he craved, also he'd have been bored shitless in about 3 months.
The criminality might be low rent, but the kicks are about selfworth, every time he cons someone he's proving himself to be smarter than them, to him a shortcut is better cause it's faster. He cons the system with his skill set as a lawyer which provides the validation.
I suppose in that way he is similar to Walter, who was all about the power and pride, the money seemed important to him, but wasn't really, he kept coming up with rationalisations for ever higher numbers.