I hate to add to the conspiracy, but I do love a good conspiracy theory
They charge no fees for trading and have 0% fees on their pool. The maintenance fee is not high enough to be the sole source of income. What is their financial motivation to provide this service? Crashing Bitcoin value and then relaunching the Bitcoin concept as a government/banking backed system would potentially be very profitable. I don't see where crashing the value of Bitcoin hurts them at all.
They own a lot of the hashing power on their own pool. That's direct profit. They are part of the same group as CEX, who's per share (~4 USD/GH) is outrageously expensive. If they reinvested 90 percent into hardware to keep up with/expand the network, they would still be profiting handsomely.
On it's surface, you have an interesting argument, but it don't hold up.
As to them being in London's financial district... They aren't. It's just an office. They are, IIRC, a Russian company.
I don't mine with them, as they were difficult to set up for me, and Eligius is not. And frankly, Wizkid provides better customer service.