Because the graphics look better
It's like asking why do people care about using high graphics settings instead of low. Or why people will buy a PC that's cost 3 times the price of a PlayStation.
This is dubious. When a game has *properly implemented* baked-in lighting, it looks great. When devs use ray tracing as an excuse to phone-in the baked-in lighting, then yes, ray tracing looks better than crap-tier baked-in lighting.
Control is an example of such a title. Ray tracing looks nice in Control, but when you turn off ray tracing, it looks like a 6-year-old coded the lighting on a "bring your child to work" day.
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