From what I understand of airships, they will be insanely expensive for a while...but after a while, people won't buy them as much, and they will be about as common as the ex primal ponies if not more so. Then people will see like everyone has it and be even less willing to shell out a ton of money for one and the price will plummet to nearly nothing. At least, this is what I saw happen a couple times with other airship-only venture materials that I buy for crafts I sell.
Then like 2 patches from now there will be a new mount released with same currency and price explodes again? :P