Yeah, those are "collectors" prices. Considering the technologies range between Industrial Age to 1940s technology, those weapons would be far cheaper in they were in production, even at a cottage level and closer to the prices of common battlefield weaponry of similar performance.
I'm in a campaign where the GM introduced wire-guided missiles used by low-tech insurgents and they are devastating, if they hit. They have similar weaknesses to early wire-guided missiles in that they can be dodged, the missiles could be shot down, or the firer killed before impact.
Before introducing WGMs to a game, I suggest you do some research on how they worked in combat, not just in theory.