Sometimes when they are losing a little in price. I believe that they will get a widespread use in future
I don't buy bitcoins. It seems to me that to buy bitcoins are the only investors, but the instability of the course scares them. At the moment there is nothing that you can buy only with bitcoin. Maybe if it will appear then it will make sense to buy bitcoins. Now everything that you buy with bitcoins you can buy with another currency. Why lose money on the exchange?