Some individuals are perhaps purely intrinsicly motivated, but I think it's a very tiny minority. I also think there is a good chance that intrinsic motivation itself is a status enhancing adaptation, evolved by runaway selection. So ultimately, you are executing this adaptation whether you want or not, much like this fish carefully creating beautiful patterns in the sand, not knowing why he is doing it. It's all about sex.
https://www.youtube.com/watch?v=B91tozyQs9M
https://en.wikipedia.org/wiki/Fisherian_runaway