I think this has already been said, but I doubt many, if any, sellers are on here to make profit. If so, they probably sell off ARC too. The only reason I would buy a pricey, high end coral is because I can can afford it and I love the coral. I would never spend a bunch on a coral solely in the hopes I can make money on it.
It's not like super high end corals are being sold for cheap in huge quantities here, right? If you find a really good deal on here it feels special and just makes you appreciative of the local community. In the general market it's really just what others have said, natural depreciation.
I've heard the opposite complaints as well, that people were annoyed they gave someone a really good deal because they thought they were just starting out or something and the person turned around and sold it for way more. It can go either way and in the end, as others have said, all that matters is what the seller wants to ask and what the buyer wants to pay.
There's plenty of really useful reasons to selling coral cheap as well! Personally, I have a single nano tank that is my beautiful baby, and no room for anything else. Corals get too big pretty quickly and I don't like a bunch of frags crowding the place. I know if I sell all my frags for cheap I can get them out asap, and having a pristine display tank is the most important thing to me.
Definitely just all about spreading the love when it comes to coral, so obviously I'm one sided on this. I get rexx's point, but just don't agree at all on the importance of keeping prices high. Why shouldn't we all just have nice things if they are things that continually reproduce? Go ahead and call me a reef tank communist. What I think is important is being able to keep a beautiful coral alive. Anybody can get a deal on a fancy frag here and there, but can you keep it growing with excellent, full polyps, and the brightest color that coral can achieve? If I buy a high end coral, it's growing well, and I sell the frags for cheap, I take pride in the fact that I've got the big, beautiful mother colony all these other starters came from. Other times I just can't get a coral to do well in my tank, and I'm happy to let others give it a go at a low price.
To be really frank, if someone is incredibly upset about a coral being devalued, it sounds like maybe they shouldn't have spent that much in the first place (either paid too much or couldn't really afford it). Coral buying is addicting, y'all be careful out there. Do it cause you love it, not cause you're going to strike gold. Buy the most expensive corals cause you want guarantee on exactly what you're getting and/or you want to be the cool kid on the block for having it first.
One more point, to Chuck's original sale post, I think the initial responses were cordial enooough and reasonable. Maybe it would be better to just not comment in some instances, but I personally would love to hear if I put a price on a coral that was way too high for this market, especially if it was from someone that had a good bit of experience selling that coral here.