Appreciate the replies, but none of them address the core problem I pointed out which was that the new price is several times higher than the price these were previously listed during their previous one-day sale last March.
I've bought all the packages that were available so far - as I'm sure many others did as well, but I unfortunately missed out on the one-day sale they had last March for the Elite Weapons Voucher 🙁. Here's hoping they offer more packages or vouchers in the future.
As for the price of the Immortal and Onyx weapons, I, as well as others, had thought those prices were ridiculous as well. I think this was one of those cases where not many people screamed because not as many cared about those sets. I could be wrong about this, but I've seen very few people ask about, or use, the Immortal skins, and I've only seen a handful of people using the Onyx ones. I honestly was surprised when they listed the Mythic weapons at 150, since I was expecting them to move the Immortal, Onyx, and Mythic to the 60/45/25 increments that the other Black Lion weapons received. Guess I'll hope that they lower the price once they add the Gold Essence weapons to the list.
Lastly, I agree the skins should be more difficult to get than the standard Black Lion weapon skins - it's why the Elite Weapons Voucher was sold at 1200 gems / weapon when it was released, vs. the normal price for Black Lion weapon skins (400 - 600 gems). It's a bit extreme to say these skins should cost more than most legendaries though, considering they come without the quality of life features that legendaries have (these are simply skins).
Alas, I'm not expecting ANet to make any changes to these prices, was simply looking to vent my frustration. I'll hold out hope that they offer the Elite Weapons Voucher in the future as a way to buy these at a discounted rate, with the changes they made to the March sales (lasting more than one day at a time), hopefully I won't miss out if it comes up again.