Why is it that when you walk into a medical facility for health issues they always wanna make sure you spend as much as possible?

Their financial health issues are also of paramount importance to them. Plus, depending where you are, they probably figure they're just going to soak your insurance provider rather than you directly.

its a profit-driven model of medicine in the US, hence, profit-maximisation. You really don't run into this attitude in countries with more rational healthcare delivery systems.

they probably want to make sure they at least offer you everything in their arsenal so you can't turn around and sue for malpractice if/when you reject it.

Because its their business to maximise on their takings.

Greed?