The problem is collecting enough of the little buggers to make a five-gallon batch. You can extend the mash with other stuff - Budweiser puts rice in theirs - but if I try sneaking a few cockroaches into the mix Big Ern will take his nightstick upside my head again.
I've got 4 80 gallon compost bins that are too wet. How many fruit flies do you need?
We have a big earwig problem this year. Let me know, I'll get a couple of cheeseheads over for a roundup. I'll bet a couple of those buggers will make a heavier beer.
Have you tried dung beetles?