What's the point of conquering the whole world if your people then can't even afford a coffee or a taxi? Where do you think all the wealth extracted from developing countries ends up? And it's not like it's going to magically return there if a few people refuse to get Starbucks or use taxis.
>Even after rent, you still end up with more money than most people earn in other places.
It's virtually certain that people in management, sales or any other important part (besides engineering) of any company aren't thinking like this. "How much can I get" is much more constructive way to approach this, compared to "how much do I need".
Remember, you don't have to spend a bunch of money on useless crap, but since most people are doing just that, you can negotiate as if you did too.