I feed all my T's roaches, currently I have a huge mixed colony of lobsters, hissers and dubia which are busy breeding themselves out of house and home... The only T I have that flat out refuses to take any of these is a Lasiodora parahybana that Swifty sold me. It's close to mature and full of nonsense, will only eat crix.
My feeling is if I starve it long enough it will probably stop being a picky eater as I really dont see why everybody else will chearfully zap a roach but this silly thing appears to "gril"

Incidently, the best part of roaches is the slings and juvies who will happily take down a nymph as big as they are, poor little chaps have to stand on tip-toe just to position the roach right to eat it!!!
@ Swifty, my Stromatopelma is a digger for roaches, and will happily mine any burrower out of the substrate any time (so long as its dark), fun to watch with the T torch!