There are costs to "dedication to a job". These costs must be balanced with benefits, or choosing them is irrational.

Notice you're talking about "dedication", which is different than "I'm working on rewarding problems in a fun team". That's the opposite of dedication. Dedication is what keeps you committed to a team when it's no longer fun, working on problems that are no longer rewarding.

I've seen plenty of people give their heart and soul to startups, that ended up exiting in ways that made the founders and VCs rich, while these people walked away with nothing, often not even a job (since their old job was effectively gone in the exit). Is it rational to choose such fate?