we have used the 4 fts for the Ackies for a number of years. if we had only a couple of cages, i would go larger, regardless of animal counts. like shvar said, go as big as you can.
we have tried larger groups, but have had the most success with 1.2 and single pairs. i like single pairs the very best.
let the babies get a bit of size before offering roaches, there is a lot of chitin to digest with those, i would feed on crickets for the first couple of months (insect wise) before adding roaches or mealworms.
value on the Ackies is moderate to great. we never have a problem selling them at a good price, but i see many ads with folks selling them for much cheaper, for whatever reason. so it depends on reputation and motivation.
if you want to spin a buck, animals are not that reliable in the first place, but all things considered, Ackies are still a good project.
best of luck!
-----
robyn@proexotics.com
Pro Exotics Reptiles