The market determines the price...
If you asked $1k for the Peacock and someone bought it for that, it would be worth $1k.
If you list it for $75 and no one buys it, then it's not worth $75.
You've had it listed for 3 days at $75 (Which I feel is a good price personally....I'm just not into stomatopods although I can appreciate them).
Give it time and you'll find the right buyer.
If you dont have time, then you'll probably need to lower the price in order to get rid of it quickly.
I dont have a problem buying livestock from an individual at retail prices, (or higher depending) if they can be:
difficult/finicky to get acclimatized
eating in captivity
or ship poorly
but are in great health in the individual's care.
For example...I've had several H.magnifica anemones for several years.
Recently, one of them split in captivity. I sold the clone at retail price of $100.
I knew that it was healthy (Had since March of 06 and it had split a year before I sold it, so it was fully healed up and it was approx 8 inches in diameter), and I knew that it was worth what I was selling it for.
Had some people try to lowball me, and I dont blame them for trying. Worst I'm going to say to an offer is no...doesnt cost them anything for trying or me for denying. Best case scenario is that I accept their offer and they get it for a better price.
But I held firm and sold it for what I was asking.
Just my unasked opinion on this matter.
Pictures would help you sell it though.
Good luck.