I wouldn't hire someone who is just coming for fun unless I really knew their work ethic.
I'm genuinely curious about the thought process behind this. If someone was applying for a job and sounded like they seriously wanted to be there, yet they didn't care about money, why is that a negative thing? I thought it was a plus because it means I'm there for more than the money; I'm there for the work.
I've wondered about this exact situation, and if I should mentioned being FI in interviews. I figure there are two types of employers/jobs. Ones filled with interesting people who want to do interesting things (Think Tesla, Apple, a few other CEOs come to mind), and other people who need a pay check.
For the former type of job, being FI would be a huge plus. You're there because you want to do something exciting. For the latter, not so much. Thaese companies only want you there since you're a warm body who can generate profit for them. You're a replaceable number, and if you, (or others currently there) didn't need the money, they would likely be gone.
I recently took a job like this. Sounded fun on paper with helicopters, but if the company had their way you'd be working away from home 365 days a year, 16 hour days. Turnover was high as it was, and everyone had an exit plan, most of which had financial barriers as the only stopping point. For you to be FI in such a job makes you a wild card liability.
2Cent points out that despite somehow managing to bank high 6 figures by a young age, he still wants to question your work ethic, as if there is someone just tossing out 100k cheques to people who don't deserve them. Then he's concerned about having to replace you. Apparently he's too obtuse to connect the dots and realize that if people who don't need to be there want to leave, maybe he should reevaluate why his jobs are so shitty. If I need to lock my wife, children, or employees up with a figurative of literal chain (financial or the metal kind) to prevent their leaving, maybe I should step back and take a look at myself and how I treat them? Nah. forget that. It's those lazy, job hopping, rich bastards with no work ethic who are the problem.
Like others, the only thing that would make me return is genuinely interesting work, on a very reasonable part time schedule. Money? It would need to be well beyond the realm of anything normal. Like enough to buy a private jet. It comes back to the idea of "enough". To the man who's already eating a steak dinner, "how many more steaks do I need to give you for dinner tonight" isn't a very motivating proposition.