If you worked at Netflix and everyone around you made a million whilst you made half a million, you might give such an answer on a survey, and it probably wouldn't change with the absolute amounts.
That's something that worries me about moving down to Silicon Valley. It seems like everyone there is envious of how much their neighbors and co-workers make, regardless of how much they happen to be making. I want to avoid falling into that trap--it seems like a recipe for unhappiness.
Another perspective: Netflix is notoriously interested in only hiring top talent. Top talent is ambitious and always seeking to advance. I don't think it's a matter of envy, it's the unending beat of progress.
And,or: they hire the people most likely to feel unfairly paid, and it’s when we feel we are unfairly paid we are more motivated to negotiate higher salaries, and the more a company’s employees ask for higher salaries the more likely they are paid higher. And if the root cause of the feeling of being unfairly paid isn’t the absolute amount of money being received, then the higher salaries won’t reduce the feeling.