Finally a truthful comment. Everybody goes there to make money, that's it. There's nothing wrong with that, so why do people still try to pretend that isn't the reason when out of view of their employers?
1.) Family/spouse
2.) Where they can get the best-paying job
If you offer most people 50% more money, and they aren't tied down by family obligations, they'll skip town for that new job in a heartbeat.