Commuting to RES sucks, commuting to RES in NYC or LA is even worse due to traffic, cost, and covering multiple airports. How much is your time worth? As a senior B you can pick double commutable trips, fly with captains you like to destinations where you want to go. As a junior A with a line you get to fly with your favorite captain but you'll likely be commuting in day-prior and going home day after and while on the job you'll be flying red eyes and/or staying at layovers that nobody else wanted. So what's better, 4 days of FO pay flying a trip you wanted and then commuting home when the trip is done or 6 days away from home for 4 days of captain pay, flying trips nobody wanted, plus paying for a crashpad/hotel?
For reference, I live in ATL which is a pretty easy NYC commute and there's no way in hell I'd commute to an NYC NB below whatever seniority it takes to guarantee double commutable trips. Now, if you're single and just like hanging out in NYC then the math changes considerably.