crypto currency investing, anyone?

I've never paid a dime on taking money out of my IRA it's been a tax free investment from the start. True, all the investments are risky but gold and silver have been around alot longer than bitcoin and they will be here when bitcoin is long gone. As I said earlier, I've never heard any investment firm advertise bitcoin as a investment.
And if you kids inherit a Roth IRA it's also tax free to them!!!