I also went with a big fleet of comets. I currently have about 111 and expect that to grow to about 170 before I start to replace them with 727-100.
I went with the comet1 for 4 reasons:
1. A lot more flights per plane then the similar props. Which really helps competing against the props on the medium range routes.
2. The wide range of applications where a comet can be used. I use mine from low demand routes to England to short range flights. Allowing me to transition to two very large fleet types without having to have a fourth fleet type. Just this fact means that I can easily affort the higher fuel cost.
3. They tend to become pretty cheap in the sixties because a lot our airlines cannot make them fly profitable
. Allowing me to cheaply add routes to the network without a lot of capital outlay.
4. The sooner you move to jets the sooner you're done with the whole rescheduling and restructuring.
ps I never made real good money on the comet1 but the 3's and 4's that I have in service are real profit centers.