Well, a key difference with the stock IPO is that the "institutional investors" end up with large chunks of stock. The intent is that those "large chunks" are big enough to cut up and sell individual shares at market price, usually many orders of magnitude lower in cost, where they get their money back - plus a profit - in the volume of stock sales.
The interesting part is when you see the market (real buyers and sellers like you and me) issue a smackdown to speculators (venture capitalist, investment banks, et al) when the IPO price craters as soon as there's a public trade. The hype becomes crystal clear as soon as the light of day is allowed in. Those large chunks of stock might end up being practically worthless if someone doesn't do their homework...easy mistake for a speculator. IPO's are a sucker's game, a bit like playing the lottery, but without things being as they are there would be very very few IPO's or they would be much much smaller. We (buyers and sellers like you and me) just don't happen to be the suckers in an IPO...it's the speculators with enough money to bankroll an IPO (or help). So no worries!
The best thing you can do is simply not participate in "IPO style" coral sales, and help your friends to understand them. There's nothing anyone can do to prevent someone who has $600 burning a hole in their pocket from spending it on a half-polyp of the latest coral that looks good under blue light and a macro lens.

Notably, one cannot buy an IPO share of any stock on the open market...I'm guessing that corals and "coral IPO's" are intermixed for sale on the same "exchange".
Honestly, I think the average long term adjusted return for the stock market is still 12% or more...better than most investments that can be made by the general public. So it's not entirely a sucker's game....but the traditional IPO market is. Not sure if/how this applies to coral, but I figured it needed to be said.
Of course there are dud stocks, but if you buy what you know - a really simple rule - you don't have to worry much about most kinds of shenanigans like hype or skyscraper pricing. It also pays to have a very long term view in regards to holding what you buy. Buying and selling stock is a job (as a speculator), not an investment strategy. Don't know how this applies to coral either.
Nuff' said. Back to coral talk!
-Matt