I'd have to agree there is more and more of these popping up half of them I dont even have scrypt farms and are more or less pyramid schemes.
Yes, it could be really true that some are fake. Anyway regarding Genesis Mining I am pretty sure they are serious.
They already posted their massive GPU farm back in march and probably have expanded this with much more asics (
https://bitcointalk.org/index.php?topic=467587.msg5627422#msg5627422)
I am really excited how this will continue!
Since 1 hour I am a customer of Genesis Mining.....I think that their strength is good for us customers because they for sure can purchase the hardware by far cheaper then solo miner and therefore have this low prices.