Why should they pay more than market worth? When you go shop at a store, do you pay double the price tag just because you can? No, you don't, because that would cost you more of your wealth.
Does the average person in a first-world country donate half their wealth to the average person in a second-world countries? Does the average person in a second world country donate half their wealth to the average person in a third world country? No, and no. It's not really a common thing in human nature to give up a lot of what we have in order to support those who are less fortunate. You might say that's sad, but imo it's still a fact.
What is curious about human nature is how, despite this lack of behavior on our own part, we expect those who have more than us to give us what they have.
Market wages and prices are fairly set, largely due to supply and demand.
> The disparity is insane right now though
The disparity is better than ever imo. I'd rather live in this time period than any other, thanks to technology, which is a great equalizer. It provides amazing quality of life improvements across so many areas, from education and healthcare to entertainment and food; then capitalistic competition absolutely demolishes the costs of this tech, to the point where prohibitively expensive tech becomes affordable to billions.
Today, a middle class person can eat a cheeseburger that's just as good as what Bill Gates is eating, drive a car that's 99% as good as his, travel to the same places he travels to, wear clothes that are just as good as his, read the same books, watch movies, listen to the same music, go to the same plays, etc. The rich sit in slightly bigger chairs, enjoy slightly shorter waits, and many other improvements that historically would've been considered negligible compared to the gaps between kings and peasants, nobility and servants, owners and slaves, rich and poor.
In fact, the richest are having to resort to paying insane prices for useless luxury goods and brand names just to differentiate themselves. Or paying outrageous sums for luxury toys like yachts and planes that most wouldn't even want.