They were irrational because if you analyzed all the coins in the top 100-200 you'll realize that it was primarily cheaply priced coins that were making the outsized gains and a lot of it can be attributed to market psychology.
It feels better to own 200 of something you don't understand than 0.00159. But at the end of the day returns are returns and it makes no difference if you have 200 of a coin or 0.00159.