I've got a few thousand roaches, of which maybe 400 are adult females, of B. dubia and B. lateralis. The colonies sustain about 100 T's and one juvie Beardie. And the colonies are growing.
I'm not feeding my colonies too richly, mostly increasing two days before feeding time for the T's. I'm keeping them hot and dry.
Then I've got a few hundred N. cinerea and lots of P. pallida, which are excellent feeders for my slings.
Of B. dubia I feed mostly adult males to the Beardie and the large spiders, the juvie T's get mostly adult male B. lateralis and the odd N. cinerea, and the small T's are fed mostly from the P. pallida colony.
I do spend money on feeding the roaches, but never on buying crickets ever! I keep my roaches a lot like PeterUK *highfive*