and rest assured that the site has a reasonable chance of not losing all their bitcoins.
... and rest assured that the bank has a reasonable chance of not losing all your money, because it is FDIC insured? Sounds familiar?!
The Federal Deposit Insurance Corporation (FDIC) is an independent agency created by the U.S. Congress to maintain stability and public confidence in the nation's ...
The FDIC provides Desposit Insurance for certain accounts up to a certain amount.
It does not prevent a housing bubble, or prevent the banks from "investing" your money.