He does not need it. He is fully self-sufficient. Infinitely so.
That said, He does want your obedience, which shows that you trust Him and appreciate what He has done for you.
Time to put things in perspective ...
FYI, it's not your stuff. It's His.
But He does want you.
He wants to know that you know who He is and what He's done for you. He created you and the time and place you live in. He suffered and died to pay a debt you owed. He wants to know that you appreciate and trust Him. He wants you to obey, not because He needs your obedience, but to show that you realize that HE is all-knowing, all wise, and all-powerful ... an infinite being who simply knows exponentially better than you.
He is your ultimate Father. He wants your love and respect, just like we want love and respect in the relationships we have with others. Again, He doesn't need it. It doesn't make him more complete, because how do you become more than infinitely complete?
Trust Him in His promises, and show that you realize becoming more like his Son is what's best for you. That's obedience. And that humble heart is what pleases Him.