For scrypt based altcoins, the difference between GPU and asic isnt nearly as big as for SHA. Im no expert in altcoin mining, but afaik, GPU's will be cheaper per MH  while efficiency is only 'a bit' worse (factors, not orders of magnitude). So if you have really really cheap electricity, it could make sense.

Here is the problem though: they claim to mine with 7970's, which would yield ~700Kh each. They have sold over 6000MH. Thats ~8500 of such GPU's. SO seeing 60 in a picture doesnt exactly convince me. In the early days of bitcoin mining, many of us had larger private farms.