Lower wages don't make the developer's home and medical insurance any cheaper. The second the devs start adjusting prices, American devs with money to spare will turn on their VPN and pay a fraction of the price. The general public does this with stuff like Netflix and YouTube Premium all the time, it's not exactly uncommon. Companies that charge less according to average wages are being nice, but that's all just a choice to make sure they're at the top of their industry. Go to the supermarket and tell the cashier that you're entitled to a lower price because you only make minimum wage, see how that works out.

If you can't afford this product then you can just not buy it. You're not entitled to every piece of professional kit, especially a tool that's basically Meld with support for pictures and Office files. It's a luxury product, hardly a necessity, just like high-end smartphones or brand soda.

Furthermore, this is a piece of Mac-only kit so if you're in the market for this tool you're probably already using high-end hardware. If you can afford Apple, you can save up for Kaleidoscope.