> Either way, engineer wages at Google would not be a factor.
...for you. It would be a factor for who you are trying to hire. If who you are trying to hire sees Google engineers making $$$, but you are offering $ for job X, and they do not see it as an unbridgeable gap in their own aptitude, they could well say "I am going to instead try to be an engineer at Google so I can make $$$, instead of being offered $ doing X". This happens all the time.