What are you actually playing with a 5090?

I have a 3070 and play everything I want to at great frames. With the exclusion of Tarkov which I don't think anybody on the planet can play that game on all high. Why exactly are people paying so much money for a 5090? And graphics cards are one of the most quickly depreciating things you can buy. What's the point of blowing that money so that in a year it can be worth half the price or less?