Double spend doesn't involve printing money. Especially it doesn't automatically give you twice the amount of cryptocurrency you already had. You need some othe

Double spend doesn't involve printing money. Especially it doesn't automatically give you twice the amount of cryptocurrency you already had. You need some other half of the double-spend transaction to take from, and that may be tricky to do, especially at scale (and especially if you want your ill-gotten gains to be worth anything). You can make money off of a double-spend attack, but it's not as simple as 'you double spend, then get as much money as you want'.