Commercial Aircraft are made to make money.
I fly all current models of the 777 and the 200LR/200F are by far my favorite to fly...
BUT the 200LR is not a big money maker.
As range increases, yield reduces so you need more payload (in this case passengers) to be profitable.
Long range/ small cabin is NOT a good commercial mix, so the 200LR is rather a "Niche" aircraft use on a few long, thin routes to maintain a network, not necessarily to make money in isolation.
The 300ER is a much bigger money spinner, and all future development of the type is centered around new versions of it.
The 200F, however, is a remarkable aeroplane with quite breathtaking economics- and is just as nice to fly!!