How important is the birthright?

Gen 25: 30 And Esau said to Jacob, Feed me, I pray thee, with that same red pottage; for I am faint: therefore was his name called Edom.
Gen 25: 31 And Jacob said, Sell me this day thy birthright.
Gen 25:32 And Esau said, Behold, I am at the point to die: and what profit shall this birthright do to me?
Gen 25:33 And Jacob said, Swear to me this day; and he sware unto him: and he sold his birthright unto Jacob.
Gen 25:34 Then Jacob gave Esau bread and pottage of lentiles; and he did eat and drink, and rose up, and went his way: thus Esau despised his birthright.
Gen 49:3 Reuben, thou art my firstborn, my might, and the beginning of my strength, the excellency of dignity, and the excellency of power:
Gen 49: 4 Unstable as water, thou shalt not excel; because thou wentest up to thy father's bed; and defiledst thou it: he went up to my couch.
Deu 21:15 If a man have two wifes, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated:
Deu 21:16 Then it shall be, when he maketh his sons to inherit that which he hath, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn:
Deu 21:17 But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.
1 Chr 5 :1 Now the sons of Reuben the firstborn of Israel, for he was the firstborn; but, forasmuch as he defiled his father's bed, his birthright was given unto the sons of Joseph the son of Israel: and the genealogy is not to be reckoned after the birthright.
1 Chr 5:2 For Judah prevailed above his brethren, and of him came the chief ruler; but the birthright was Joseph's.
2 Chr 21:3 And their father gave them great gifts of silver, and of gold, and of precious things, with fenced cities in Judah: but the kingdom gave he to Jehoram; because he was the firstborn.
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