Successful companies exploiting people

I was reading an article in Fortune about how everyone is flocking towards Google in a search (haha) for a better opportunity with a more successful company and a better package. This puts Google in a position to call the shots and to try to get many smart people for a very low price. They can exploit their prospect pool and not provide a competitive package, even though they are making tons of money. How does this catch 22 get resolved?

On another note, once a new employee gets into Google, he may find himself a complete pauper compared to someone who has been with the company since before the IPO. Does this provide a lot of tension for the workforce?