In case you're wondering, that's essentially what they mean by "The Bernanke Put". Consensus has it that the Fed's willingness to print whatever amount of money for however long it takes to get this economy moving could bolster the stock market for Lord only knows how long - perhaps explaining the market's recent buoyancy. However, like a true put option, there's a cost. In the case of QE
In my granola bar example, if you and 5 other desert-island-castaways bargain for the last granola bar in your possession, it's worth whatever amount of money your hungry friends have on them. If there's a dollar amongst them, assuming you're of a mind to sell, it's worth a dollar. If there's ten, it's worth ten. I.e., the supply of money growing faster than the production of goods = inflation.
The not-so-obvious cost would be the moral hazard of perpetually low borrowing rates. Here I'm thinking government borrowing. As you may have gathered from my recent rants, I find "politician" and "moral-hazard" to be synonymous. Washington can borrow money on the cheap, which could be huge in terms of reducing the deficit and the debt. However, alas, like the 2006 homeowner (now renter) who refinanced his mortgage and found himself with left-over cash flow and a home equity line of credit, our utterly-fearless leaders seem to have other things in mind.