Okay good! I realized what I said didn't come out the way I meant it to! There is nothing wrong with understanding your limits and trying to work within your means. What I'm bothered by in the case of this seller is that they don't really care; and seem pretty unrepentant about doing this, with the information they are sharing making it sound easier than it is.
One trend that seems to have lost favor over time is fostering seahorses. When someone couldn't care for the offspring of their seahorses, but didn't want nature to "take it's course", another aquarist often stepped up to try. There was an etiquette to it - it was always done for free, and if there were survivors, a pair or two went back to the original owner. For long distances, shipping for the fry was usually paid for by the "foster parent", but not always.
But the one rule that always existed was that you never charge for immature seahorses. There are tons of circumstances someone might not be able to raise them. But it was always a manner of pride, thou shall not sell seahorse fry.
I am still unhappy about it, especially as the seller's response was in denial about what they did as being a problem. So I wrote an article, in hopes of exposing the issue and providing guidance to others: http://fusedjaw.com/breeding/selling-baby-seahorses-is-wrong/