I would say if you truly believe in a coin double down if you can. If you bought 1,000 of a coin at $10 and it drops to $2 then buy another 1,000 well for an extra 20% investment your cost average just went down to $6. You'll be back in the money a lot sooner and your upside potential longterm doubles. Of course, if you don't have the money to risk you don't have the money.