FOMO is the only reason people attend conferences, which is why I visited a few to figure out whether I was missing out on anything.
Speaking at a conference? Same story. You do it, because it's for "personal development", until it's pointless.
Conferences have n00bs and PMs, not the experts, because they don't need to learn anything anymore.
actually, the primary reason to go to conferences is networking. meeting people, make connections. you go to talks that interest you so you can meet people that share your interest.
same for giving presentations. you give presentations to promote an idea or work, to share something you have learned, to contribute to the community, and again, for networking.
fomo? not at all. personal development? that's a bonus, but not the motivation.
> Conferences have n00bs and PMs, not the experts, because they don't need to learn anything anymore.
The real experts never stop learning.
Some of them go to conferences because that's one of the few times in the year they can hang out with each other, and find out what their community is up to.