I am not a proponent of greed in trading but I have this to say, at times may be a very few situations, greed has made some persons luckily hit a good profit level due to how hurriedly they traded on a particular coin while others came in late by way of going to do much research about it.
Am not saying research about a new coin in the market is ain't advisable but ones in a while a good trader need to take some greedy risk especially with an amount they can easily let go.
The last part of your statement is right. If you can let go, the amount of being greedy or taking the big risk is okay.
We never know how the market will turn and the kind of opportunities might be wasted if you will not act right away,
Though it's not always that luck will grant you the right position and most of the time that kind of luck is just limited in a
short span of time, it's up to you to take it as long as you are willing to lose the amount of investment then it still a good call
even in some instances, it's a kind of greedy strategy.