Sacrifice was for us, not Himself.
And you make this claim in spite of what the Bible says to the contrary. As I have said before what many believers miss is that Jesus' life and sacrifices were not really about us as much as if was about what he and his chosen elect would get from it.
Have you not read Luke 22:29 where he talks about the kingdom that was promised to him or Acts 2:33-36 where Peter speaks about Jesus being elevated to Lord status, and let us not forget what Paul said in Philippians 2:9-10 about Jesus' obedience unto death resulting in Jesus being given a name above all names.
Bottom line according to the Bible, Jesus had something to gain from all of this and the byproduct was the availability of the gift of eternal life for Jesus elect and those that were willing to submit to him as their king. Those that were not ready to bow to King Jesus be damned (Luke 22:27)!
I can not tell you why God does what He does. It may seem silly to you, but that would be an argument from incredulity, a logical fallacy.
Just because you personally can not think of a reason doesn't mean there is no reason. I hope to ask God one day.
I am not big on arguments from incredulity.
I'm gonna be bluntly honest with you Skeptic, your god exists exclusively in your own mind so you should be able to tell us the whens and the whys about it. You created it based on your conditioning, understanding, circumstances, biases, beliefs, moral values, and other personal criteria. Your god many share many similarities to other people's god, but each of you has individualized your deity to the point where they all vary from person to person. Here you will see that phenomenon charactorized as SPAG.
Like mostly all believers your understanding and the god that developed from it was built around the"scafolding" of perhaps the Bible. You drew an image from that and created a fuller picture based on your perspective and understanding, personified that picture so it's relatable, and then assigned to it all the glory and majesty of deity you know how. You must realize that the 'scaffolding' you were given as the basis for your god-creation was given to us by men who injected their prejudices, phobias, morality, values, and perceptions of reality into various writings that have been compiled to form the Bible. They used the God Concept to give credence to their beliefs and actions they deemed as righteous. Please try and understand that the god you have in your head/heart is NOT one and the same with the depiction(s) of god(s) those ancient men wrote about. Your god is quite likely more humane, more advanced, less tribal, less prejudiced, more compatible with modern science, and is more cohesive. Hmm, why is that?
All that to say that you have built your god on a weak foundation and because of that you have had to run with and make a ton of assumptions. When confronted with this reality your are forced to try to rationalize what many would say is irrational or you must use circular reasoning or obfuscation. The God Fantasy your mind is delivering to you is making you work to hard to maintain the illusion. It's time for you to choose to question the illusion your mind is presenting and demand solid, irrefutable verification!