When you sell anything of value to another party both parties want proof that an exchange took place, this is for protection of both parties. The seller has proof of sale and the buyer has proof that he has received something of value through a free will agreement.
Now this document is called a “Bill of Sale” in this particular exchange, the same procedure is used for any exchange of goods or services including your Birth Certificate.
The seller must give the buyer the original bill of sale and the seller must have a copy for their records, in other words the new owner must have the original document signed by both parties detailing the exchange. The buyer having the title of whatever has been exchanged.
Now consider what happens with your birth certificate, do you have the original certificate? no you have a certified copy, ask yourself who has title to the birth certificate? well it’s not you as you only have a copy.
Does your birth certificate has any value? and if so, who would collect, you having a copy, or the state, having the original?
The question is does the birth certificate have value?