Thanks for the input.

So but what I'm still not sure is.

Simply with the example I gave, I know for sure that if I sell the price will fall significantly.

So if I buy back the moment I sell, I buy it cheaper?

For example:

Coin value is $1 because I have a 1000 coins. Selling now would mean 1000x$1=$1000.
Coin value becomes $0.50 because I sold 1000 coins. Buying immediately after my sell would mean 1000x$0.50=$500. That would instantly make me $500 better off.

Is this true, or do I not actually buy at $0.50, even though it is listed as $0.50. But my act of buying forces the price to go to $1. So I'm still buying at $1? But that wouldn't make sense because
if someone else bought it for sure, they would be buying at $0.50. So this does mean dumping and buying immediately would give me result. It sounds too good to be true.