The only other teleports that have been released at 25 credits per set were the Architeuthis which are now worth 90-100 credits after just a year and a half.
Do you think this will be the case with the Rare Iron Maiden?
Personally I think they may do well in the distant future due to pairs being split up but not as well as the architeuthis due to the design of them, they don't fit in nearly any room as the architeuthis do and the architeuthis can be stacked underneath things due to how flat they are.