Just let them buy when it is higher, that's always good and that will always make sure that we end up with a good result one way or another. Life will give us a lot, but it will probably give some of them some profits too so I am happy for them and thanks to them I will make all that money.
One person's loss is another person's profit. The market runs on buy sell right? So if person A buys it and makes the price higher, then if person B sells it, then the price will fall down. That's the same thing that happens with the crypto market. If people keep on buying and make the price higher, there will be people ready to sell. Just like you said, you will get a better value if those people keep on buying. But if you want to profit from it, you will sell for sure. It's not only just you, there are others waiting for that too. So the price will fluctuate and those who buy the green will be in red again. And they can't keep it up for forever.
Take the chance while you can make a profit. Don't get affected by greed. It will only lead to losses.