The Atonement Money

To understand redemption and ransom in scripture you must see that two different definitions are being used. One is buying back the other is retrieving or recovering from something bad.
redeem
1a : to buy back : REPURCHASE
2: to free from what distresses or harms: such as
a: to free from captivity by payment of ransom
b: to extricate from or help to overcome something detrimental

Here are verses indicting a purchase:
1 Pet. 1:18 Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;
Psa.49:6 They that trust in their wealth, and boast themselves in the multitude of their riches; 7 None of them can by any means redeem his brother, nor give to God a ransom for him: 8 (For the redemption of their soul is precious, and it ceaseth for ever:)
Lv.25:25 If thy brother be waxen poor, and hath sold away some of his possession, and if any of his kin come to redeem it, then shall he redeem that which his brother sold. v 31 And if a man will at all redeem ought of his tithes, he shall add thereto the fifth part thereof. v51 ...he shall give again the price of his redemption out of the money that he was bought for.
Num.3:48-9 And thou shalt give the money, wherewith the odd number of them is to be redeemed, unto Aaron and to his sons. And Moses took the redemption money of them that were over and above them that were redeemed by the Levites:
Num.18:15 ...the firstborn of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem. v16 And those that are to be redeemed from a month old shalt thou redeem, according to thine estimation, for the money of five shekels, after the shekel of the sanctuary, which is twenty gerahs.
Ruth 4:6 And the kinsman said, I cannot redeem it for myself, lest I mar mine own inheritance: redeem thou my right to thyself; for I cannot redeem it.
Exodus 21:30
If there be laid on him a sum of money, then he shall give for the ransom of his life whatsoever is laid upon him.
Exodus 30:12
When thou takest the sum of the children of Israel after their number, then shall they give every man a ransom for his soul unto the Lord, when thou numberest them; that there be no plague among them, when thou numberest them. v16 And thou shalt take the atonement money of the children of Israel...
Proverbs 6:35
He will not regard any ransom; neither will he rest content, though thou givest many gifts.

Here are verses indicating 'to free from distress or harm'.
Eph.5:16 Redeeming the time, because the days are evil.
Deut.7:8 But because the Lord loved you, and because he would keep the oath which he had sworn unto your fathers, hath the Lord brought you out with a mighty hand, and redeemed you out of the house of bondmen, from the hand of Pharaoh king of Egypt.
Psa.25:22 Redeem Israel, O God, out of all his troubles.
Psa.107:2 Let the redeemed of the Lord say so, whom he hath redeemed from the hand of the enemy;
130:8 And he shall redeem Israel from all his iniquities.
Isa.1:27 Zion shall be redeemed with judgment, and her converts with righteousness.
Isa.63:9 In all their affliction he was afflicted, and the angel of his presence saved them: in his love and in his pity he redeemed them; and he bare them, and carried them all the days of old.
Ex.6:6 Wherefore say unto the children of Israel, I am the Lord, and I will bring you out from under the burdens of the Egyptians, and I will rid you out of their bondage, and I will redeem