Yea, I'd have to agree... Them buying their own hashlets that are basically virtual machines that they create out of thin air makes no sense..
Makes more sense people are constantly browsing the market and/or bots are at work.
It makes a lot of sense to grab the pricing errors, and resell them - nearly 100% profit instead of 10%. They also refuse to implement even the simplest fix for the pricing errors, i.e. entering the price by MH/s or GH/s instead of the total.
The only reason I don't quite believe this conspiracy is that they don't seem to be technically capable of pulling off something like that without botching it.