Good luck man. I'm going through almost exactly the same thing. I am also 28, built up a big "runway" of savings, and my last day at work is next Friday. Hope your ideas work out for you!
Not saying this will happen to you guys. Just saying there's a risk. Speaking from personal experience.
If you can't wait for the startup bug, why not do it on the side for now?
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Looks like, in this market, the best I can do is fifty bucks. This kidney has a lot of wear and tear. If it were in mint condition it could pull a lot more.