So that's great, the SNB is the buyer of last resort for falling-in-value euros which it then trades for euro-denominated paper yielding essentially nothing and that can only fall in value from this point. Outstanding.
And what happens to the SNB balance sheet/income statement if German 2-years go to 0% (yeah for the SNB) while the euro drops to $0.90 (boo)?
Let's take it a step further. What if this Blocher fellow amasses more power in Switzerland, Jordan doesn't get appointed as SNB chair, and markets get a sniff the SNB may want to sell its euros (meaning it would have to unload its German paper)? Those German 2-years could plummet in value while the euro falls even more. Hello IMF.
I'm not saying this will happen or even that it's more than a remote possibility, but there are no free lunches even if you're a central banker with your finger on the printing press button.