The SNB experienced a massive capital loss when abandoned their peg from 2011 in early 2015. They entered and exited their positions due to politics and global capital distortions.
http://www.bloomberg.com/news/articles/2015-07-31/snb-posts-...
http://www.economist.com/blogs/economist-explains/2015/01/ec...
It is a tautology to suggest that a market price is by definition fair - after all it was agreed by both buyer and seller. But markets themselves can be unfair - in the most basic sense, by the participation of shills.
https://en.wikipedia.org/wiki/Shill
And in our current economic environment: the concept of too big to fail. Politically, we've accepted an asymmetric reward structure for some market participants. This results in market distortion and unfairness to others.