$500/mth is $6,000/yr At a 4% safe withdrawal rate what you've built is the equivilent of saving $150,000. You should be EXTREMELY proud of yourself, and never underestimate the power and value of the asset you've built
Without taking anything away from OP's achievement, I'd caution against this kind of exuberant comparison without some qualification around it. The risks to that app's continuing to yield $500/month in perpetuity are quite different (and, I dare say, worse) than the risks faced by the kind of balanced portfolio that "safe withdrawal rate" implies (to me). I acknowledge that you didn't directly compare with such a por…
I made the valuation at 5x yearly profits.