I think this is a mischaracterization, as 1) I don't think giving everything above a certain threshold is a majority behavior (note that GWWC's pledge only requires you to give 10%), and 2) EA's discuss investing for the purposes of giving more later.

What I was trying to mean was that effective altruism might benefit from those who don't retire, per se, but become financially independent early in life, and can remain so for the remainder of their lives, so that they can spend the rest of their careers volunteering for effective causes and organizations. Thought I can't find the particular blog post right now, I recall Peter Hurford pondering that if he concluded doing direct work in effective altruism was the path for him, instead of earning to give, he might keep working a high-paying job for sometime regardless. That way, he could gain valuable experience, and use the money he earns to eventually become financially independent, i.e., 'retire early'. Then, when he is age forty or something, he can do valuable work as a non-profit manager or researcher or personal assistant for free. I can't recall if he's the only person who has considered this career model, but maybe some should take a closer look at it. This is how early retirement beyond frugal living habits might benefit effective altruism.