I actually appreciate you telling me that. My leopard gecko already recognizes the smell they give off because he'll run out of his hides to check on me as I check on the roaches. I don't know who is more anxious for him to eat Prime South American Roach Steak, me or Jim.
I figure that once I get to around 6months like you said I'll have a reasonable turnover if I supplement with supers and crickets (ever after until never ever again)
But I can see why a herp would want a roach over a cricket. the roaches are soooooooo juicy looking.