Why should it? Most software engineers don't have significant equity i.e. equity that creates a cash flow equal to 100% of their salary annually. I only make this comparison since 141k is median at Google and you are saying lots of software engineers make 300k.
Standard new grad package at Google gives you over $120k worth of equity over 4 years, and I think additional $30k a year is definitely worth mentioning. For more experienced people it's obviously even more, and if you manage to stay for 4 years, the next stock grant will probably be significantly higher to keep you and your acquired inside knowledge inside the company.
At companies like Google or Facebook, you expect to get 10-15% salary raise every year for the first few years, and around 10-15% annual bonus. Assuming that after 4 years, your equity doubles, the $300k figure seems to be pretty accurate for the fifth-sixth year of working there.
Yes, so $300k puts you in the top 3%, $380k puts you in the top 1% of earners nationwide. The median salary of presidents of private Universities is $400k. If you start at a salary of 150k and get 0.15 raises annually for 5 years, yes your will make 300k a year, but I'd be very surprised if this is the experience of general employees. Google has 50,000 employees. If you paid them all $100k, that would be 5 billion roughly equivalent to Googles costs.
