https://www.glassdoor.com/Salary/NASA-Scientist-Salaries-E73...
https://www.salary.com/research/salary/posting/senior-scient...
I no longer know the current prices for EB2 total cost. But years back I know the cost was >10K+ per employee, accounting for multiple filings, expedited filings, lawyer fee, etc. I doubt it would be below 10K now. Even an NIW can cost 15K easily by going to a law firm and personally haggle the price with them. Can you tell me how do you know EB2 cost less than 10K?
An online paper mill graduate would have a very hard time passing EB2 vetting. Where would they get the paper citations, the impact, the achievements required? Unless they have years of experience in which they made clear they are valuable enough to the field. That is why I said experienced masters. And you think USCIS don't look at what institution the applicant comes from?