Those who invested in bitcoin way back 2009 had not experienced any bull run before nor have much knowledge about the blockchain technology, yet they took the risk to invest. You and I have witnessed a bull run and heard about the numerous potentials of crypto so why do we still have to feel reluctant to invest in bitcoin. Let's be optimistic about our digital assets because its all we have.
Back in 2009 people invested/earned/mined bitcoin because they were purely interested on the technology. They never expected the value to go this high. They just wanted to experiment with the new "currency" system (read payment system). You do realize that back then only people who were interested in technology knew about bitcoin, right? It is now we are seeing people who are just interested on the money investing on bitcoin. Trust me, you will find tons of people who has no clue how the technology works.