They are more profitable because of a decline in quantity-demand numbers throughout the system. For example, if demand was 500 seats per day on a
PHX-
SLC route, then it made sense to have five 737s operate the route daily. When that demand falls to 250 seats per day, however, it's better (and more convenient to passengers) to operate 5 ERJs rather than 3 737s. You reduce your costs, maintain your yield, and still offer your good customers the same frequencies.
I doubt customer satisfaction has anything to do with it these days..... Perhaps I'm alone in this sentiment, but I almost enjoy RJ's more than larger jets.
Depends on who you're talking to. If you live in a place like
SLC or
CLE, where mainline aircraft were common, you generally hate the
RJ (at least on longer routes). They are smaller, feel more cramped, and can't handle much carry-on luggage. If you live in a place like
ABI or SJT, however, you love the
RJ because it means you no longer have to deal with turboprops. Personally, I prefer the
RJ to mainline aircraft on shorter routes, because boarding and deplaning are much quicker.