What, you just mean 500 in terms of money? How much time does it generally take to get to that amount, even practically naked and tending to VIPs it's a measly 15-20 per hour. Since people are saying it's good money earlygame i feel i'm missing something.
In comparison, an hour in the cafe gets me 460 (10 buns) to 535 (13) in my latest playthrough with Milk Factory, but not Cow, and working in the spa around 2500 per full day if i go Alluring and pick the promiscuous options even without actually having sex. The Spa also has the added benefit that, when it closes, i'm one click away from the orphanage so the odds of getting caught are pretty low.