Yeah, not to be blunt, but someone there was high when they came up with those prices. Full-service recruiters charge that much - AngelList is a job board. The value prop is completely missing too, there's just a modal of "oh, btw, pay us a recruiter's fee". This would send me running the other direction from posting jobs there.
It's about 1/3rd of what technical recruiters charge. And again, it's only on successful hires. And if you can't afford it, you can give equity. And it's an honor system. And it's a test. And other folks in the space, like DeveloperAuction, charge more (Google around). But you can't please everyone :-)