I must be an idiot, I've been a cofounder or first hire in 6 startups (2 successful) over the last 25 years and have literally never been offered secondary during a Seed or Series A or B.
You don’t necessarily get offered it, you demand it as a term. If it’s a “hot startup” you pick and choose your investors so if some don’t like it they can walk.
It depends a lot on the startup. I have similar number of startup experiences, and only one had early stage secondary sales ( but those were even for non founders ). Mainly money comes from IPO or other exit.
100%. The one thing you get at a bigco is bigness -- you can release a product to potentially millions of customers on day 1. When you call on a possible customer or partner, they return your call immediately because BigCo is on the line.
On the other hand, I can't stand how corporate politics corrupt a product's vision. Even low-level politics like "strategy taxes" are infuriating.