I dont believe you understand what tithing is. Or what it was meant to be for. Look at it for a minute under old ways. There was a kingdom, and the head of this kingdom was the Temple. Now God set apart many things for the people to do. Not just tithing. But he expected them to give offerings (of their harvests and firstborn) all things set out according to the law under Moses by God.
Later we get little hints in the scriptures what all this means with Jesus for example: Temple tax: What thinkest thou, Simon? of whom do the kings of the earth take custom or tribute? of their own children, or of strangers?
Peter saith unto him, Of strangers, Jesus saith unto him, Then are the children free.
Notwithstanding, lest we should offend them, go thou to the sea, and...
The Lord was angry because his kingdom of priests (the servants in his house) were not doing their job. As Jesus had said to them: How terrible it will be for you teachers of religious law and you Pharisees. Hypocrites! For you wont let others enter the Kingdom of Heaven, and you wont go in yourselves.
They were actually making it harder on their fellow man, by making more laws, heavier burdens. And doing nothing to help carry the load. They were suppose to be the caretakers of God's kingdom.
All the tithes, and offerings were theirs. Of course the Lord took up his part of the offerings, the burnt part (I couldnt tell you all of it) but I know the priests had been given special favor. For example showbread they were allowed to eat. Parts of the offering. So they were servants of God.
Now the people outside of the kingdom who give their part also should get benefits of living in the kingdom of God. They have paid their tribute and their tax money to the temple, and their tithes.
The protection of knowing God is among them. Knowing the word of God will be spoken to them. (That there shouldnt be a famine for the word of God among the people). There should not be people outside the temple begging for food. (This is my opinion, but this is how I feel). I would live in a kingdom where everyone benefits.
So now, we have to think on relative terms. We now have Jesus, the Son of God. The kingdom has only changed in the fact that we must now believe that God sent us Jesus his Son, his heir to the throne of David. The Kingdom of Heaven. But we are still to inherit the Kingdom of Heaven.
So when we give these things, our offerings, our tithes, our temple taxes, it is to build the Kingdom of God. Except now for us, we dont have to expect to get anything back from our temple priests, we get our reward from God himself. We have totally bypassed the priests.
And I personally dont believe all of our offerings to the Lord are physical. But spiritual. Such as giving of ourselves. All to further the Kingdom of God.
God Bless.