As a person living in a (relatively for the western world) low-cost-of-living area, making a decent income for a low-cost-of-living area, it sometimes feels like a local maximum. It would take a sizeable income jump to offset low cost of housing. No doubt the top world cities are the place to be, in terms of all kinds of fun and opportunities, but lifestyle would be worse there unless or until you'd broken into a really high income bracket.