i shutdown my 30Ghash butterfly miner about a month ago.
once the network total went over 40,000Thash/s, there was no real point as it would mine about 0.0810 btc/mon on average.
if you’re wondering about the math:
(your rate / network rate) * 108,000 btc/mon
in my case:
(30 Ghash/40,000,000 Ghash) * 108,000 btc/mon == 0.0810 btc/mon
Were you paying for the electrical costs? If so, I’d leave it running. That .08 monthly btc could be worth 10 times what it’s worth today in the near future (i.e., a year or two).