Satoshi had much bigger plans for BTC and he will never touch these coins. it is very likely that he destroyed his private keys in my opinion.
If satoshi really had decided to sacrifice or destroy his coins, he would have done so publicly by spending them to a black-hole address.
He did not. Which only leaves us with two options, either he wants to keep them for whatever reason or he really lost the private keys (which I personally doubt).
Maybe he's undecided what he's going to do with them. He doesn't have to spend them on himself or on materialistic things but think about the good that could be done with those coins sometime in the future. If I became a billion or a trillionaire I'd buy myself a nice mansion and a nice car or two but make it my job to try change the world in the little ways that I could. You could build a lot of hospitals, schools and affordable houses with that money for sure.