It's a shame Alcatraz can't be instructed to produce Rogues Only.
I'm doing a bit of Iron Age GvG where units take 1:30 Hrs to train ... Alcatraz takes 23 hours for the same unit.
I built 10 IA military buildings (unlocking the diamond unit in each) ... conceivably producing 100 units per day but Alcatraz @ level 22 produces 20 units (with only about 2 rogues). If you battle with 1 Original + 7 Rogues and lose 1 or 2 rogues per battle ... you're not having a great day of it.
I guess you have to use fewer rogues ... even if the overall losses increase.
Clearly, Alcatraz is more cost-effective at higher ages, where units take much longer to train.