I wanted to clarify a couple of (perhaps erroneous) assumptions in my original question:
- I see many comments comparing these salaries to recent grads hired by i.e. Google, but I didn't intend to use the words "skilled" and "talented" interchangeably. Recent grads aren't usually as effective as people with experience, and salaries tend to reflect that. I can see many reasons why a founder might be interested in hiring someone with little to no experience, but the job postings didn't specifically say "junior" in them.
- I see many comments referencing the realities of what is affordable. Yet some of these startups are advertising more than one job opening. Therefore, it would appear they are considering hiring three people instead of one person for 3x the salary. My question is informed by real world experience and written material: advice, essays and quotes including obvious and much repeated ones by Paul Graham, Peter Thiel, and Bill Gates which emphasize the concept that great employees are magnitudes more effective than good ones. Every knowledge-industry employer I've talked to agrees. Much startup advice emphasizes how bad it is to grow your team too quickly, and how a low performing employee hurts far more than a high performing employee helps. Given some of the companies are hiring for multiple positions, this could imply the salaries are considered competitive, and paying more wouldn't get a better employee.