It's strange to think that selling some means selling all. Why wouldn't you have bought some at (say) $10 and sold half of them at (say) $100 and kept the rest?

It's strange to think that selling some means selling all. Why wouldn't you have bought some at (say) $10 and sold half of them at (say) $100 and kept the rest? You would have made a tidy profit in dollars and a tidy profit in Bitcoin.