People lose more money every year stored in their bank accounts and atms as compared to Bitcoins, the only bitcoins that get stolen are because of either carelessness in handing private keys or investing in scams.
i think no people lost his money in bank, it's just lower interest if we compared with bitcoin interest (rising price).
but i think not all people who stored his money at bitcoin get interest, growing his money, some people who buying bitcoin in $700 and hold it, now lose arround 20% of his money.
You are correct i didnt even heard such thing that someone losses its money while in their banks which is unusual news you have their mate.
I believe that banks have low interest rates compare to bitcoin but btc has also a risk on having a negative profit. As same as they said when you buy at $700 then you have lossen 20% of your money .