60-to-72 Pin Converters from early NES games?

[DTJAAAAMJSLM]

I've been reading that the converter pieces themselves can be worth more than the game's typical value, but can anyone give me a rough idea? I'm pretty sure it's not going to skyrocket in value if a cart has something like that in it, but I'm still curious.

[mobiusclimber]

I usually see them for around $10 or so. That's 10x what a copy of Gyromite usually sells for tho. LOL