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human
[It's Always SUnny in Philadelphia] how succesful is Paddy's Pub?

they rarely have a rush. Dee is always buying a new car and Dennis used to ride in a Range rover. The Gang are always having escapades so presumably the bar is closed kinda often.
gpt
It's just barely enough for them to get by on. None of them have extra cash laying around.

Like the very first episode they're going through the register on a Saturday night and don't even make more than $100.

Pretty sure the bar is just straight up losing money at this point and is only kept afloat by Frank's fortune.

Dee's new cars are junkers (and Frank pays her rent), Dennis's range rover is probably something he had in high school and is just coasting along with (like everything else about him), and Frank supplies the money for their shenanigans that require funding.

And they do get the occasional run of good business. That time they were a gay bar, when they served high schoolers, and "new new orleans" were times when they were packed wall to wall and doing tons of business.