Why is Christ's death considered a sacrifice?

[John V]

What cost? Hell for two-and-a-half days seems to be about the only thing I can see that he "paid".

Why isn't that a cost?

Well, whatever it was, he got better, from all the sins of the world; however, each person having only one person's worth of sin gets to stay in hell forever. This all seems rather unbalanced and nonsensical.

Unbalanced, yes, but that's what I would expect, comparing God to man. It's nonsensical to expect the two to be identical.

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To be resurrected, glorified beyond comprehension, seated at the right hand of the creator of reality. Is. Not. A. Sacrifice.

Correct - those things aren't sacrifice. The sacrifice part was taking the sins of the world upon himself and dying on the cross.