Buy GPUs. Convert electricity to Bitcoin. Own GPUs and Bitcoin. A flaw is found in the Bitcoin protocol. Bitcoin is now worthless. GPUs still have value.
This, of course, does not work with Bitcoin specific hardware (the FPGAs in your example).
Another point to consider. It's very easy to obtain 100% anonymous (even brand new, freshly minted) Bitcoins through mining. This involves a different type of risk.
Also, mining doesn't require a counter party. You don't need a seller to obtain Bitcoins, and you avoid any possible risk involved with that. Trusting exchanges, etc.
You'd have to deal with exchanges earlier or later anyway, unless you want to just pile up Bitcoins or keep buying socks with them. Maybe your power company will accept monthly installments in socks, too.