You thinking about it the wrong way though. I highly doubt these hoes are selling box just a few times a month or year so... Yeah, $400 is "cheap", but $400/hr x 2 or 3+ a night or over the course of just a couple days adds up. Enough chicks are selling (cheap) p*ssy now that hoes can't command elite rates like they used to, but there's still plenty of money to be made. Working at Costco or other hourly bullshyt jobs will never compare.
Let's say a chick charged "clients" $400 per session (and then assume a "session" lasts anywhere from 30min to 2hrs for the purposes of this thread, rather than hourly). That chick can still easily pull down $30K+ a month, without breaking a sweat. That's over 360K per year. And that's for a real lax hoe seeing a couple dudes a day, per week WITH off days. For a real diligent hoe who never sleeps it's even more. Way more.