You're right, I dont have much experience with the saltwater side of the hobby, most of my experience has been in the freshwater world where the same issues occur with plants and shrimp. There are plants that go for hundreds of dollars per stem for no reason other than hype. It's the exact same issue that comes naturally with any hobby, there will always be a general population market and a high end market. The bread and butter equipment makes the most money as a whole, but it's the high end that pushes progress. why? because the instant they discover anything even slightly new they can add a few hundred to what they were making before. When Erio was first introduced to the hobby in the US it went for $500, when pinto shrimp first came in the entire shipment went for $3000 per shrimp to the same hobbyist.
Before I continue: I also own a fish store? dont believe me? shoot me a pm and i'll give you our info so you can give us a call. I'm not some idiot who has no experience. I've been in the business 3 years this time around and before a two year break, 4 years. So with a total of 7 years on the business end of this hobby I feel like I can make statements on this, but please, continue referencing me coming for advice to confirm something I already suspected as a reason to simply ignore what I am saying.
Now let me get to what bothers me about everything you say: you assume that because some of us are willing to pay a fortune for something we want that the seller is a "scammer". For some people it's just a price we pay for what we want.
Also: as far as expansion of the hobby goes, local fish stores are being ground down by online sales, I'm seeing less and less of people coming in wanting the bread and butter zoas, even when I price them at $1-2 per polyp or even less in some cases, which compared to most retail establishments is dirt cheap. What people come to me with money for are the designer zoas. That's why I ordered nightmares, darth mauls, and gods of war. People ask for designer zoas by name and want to pay $20 or more per polyp for some of them!
Get off your high horse and realize that everything in this hobby is only worth as much as someone will pay, and i'm not just talking corals, look at equipment or tanks. How is it that I buy a 55g one place and it costs me $55 yet I pay $120 elsewhere? Because the name sells the product. I can sell two high end zoas that are identical, one with a name, one without and ask for buyers to offer a price, the named zoa will sell for more everytime, because this hobby as a whole expects to pay for quality.
But wait! this theory doesn't apply just to this hobby does it?
It applies to the entire pet trade. If you want something new and exotic, you pay more. simply to ensure that you get what you want, that you get something different.
Side note: coral wholesale prices aren't half as high as you think they are, the difference in price between a large rock of "premium/ultra" grade zoas and just "zoas" on my list is $10 right now; these rocks come in with anywhere from 100-200 polyps on them. Prices are still low enough to easily make 500% profit on every coral sold even at "fair" prices