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If you believe its value is going down you wouldn't want to hold at any purchase price.

Are you confident it won’t go to $5? I’m not.

I would be very confident I could sell before it hits $5.

What if you're asleep when it falls?

Uhhh you set a stop loss number.

If it hits x sell. So if I was given a coin currently "worth" $15,000 for $5. I could set a stop loss of $6 and always make a profit since my initial investment was $5. Asleep, awake, doesn't matter.

Stop losses can fail when prices are falling quickly enough.

Set multiple stop losses? $6, $5.99, $5.75, etc, etc. if one fails one of the others will catch it. Hell as long as it sells before $5.01 I'm profitable. Simple as.

That’s not how stop losses work. If things are falling fast enough, You could have one trade at $7, and the next trade at $4. Sorry, you still lost money.

That's how people who haven't previously been investors through a crisis think stop losses work.

What difference would that make? You can invest $50k at $10k a piece or $10 a piece. In both cases it can easily go to $5k or $5.