I collected Esterbrook, Watermen, Schafer, Parker 45's, etc, generally inexpensive, by necessity, fountain pens, most needing just a new sack or jbar replacement, before gold skyrocketed no that many years back and I was really teed off when many, many gold nibs were being yanked off these great old pens for gold values.
A typical #2 nib only has about one tenth of a gram 14kt gold, so you can imagine the thousands of pens being stripped just to make a gram of 24kt gold.
Some nibs are worth far more that just the rare nib-less collectable pens but gold fever seems to make that point of value, meaningless.
That said, cracked gold nibs often enough can be repaired and fresh slits made at pen shows by person's with very specific tools, employing super thin blades that can cut through gold and iridium nibs, so if your favorite pen nib needs repair, it can be done.
By the way, do no waste your money on 18kt gold nibs, as the do no perform as well as 14kt nibs, in almost, if no all, cases.