I don't think *new* FA transferrable firearms are going to be allowed, ever. The absurd prices the grandfathered ones fetch is pretty good evidence I'm not alone in that belief, because transferrable ones would lose value overnight if people believed new ones would be available.
The pricing isn't immoral.
Is paying $50k for a classic muscle car that originally sold for $3k immoral?
How about $2000 for an Anaconda or Python?
How about $1000 for a decent grade Garand?
I want a Garand, and have for 20 years. I've always been unwilling to pay the premuim for one. I don't call Garand owners and sellers immoral.
How about in 2003 when you couldn't touch a full cap Glock mag for less than $100? People were buying and selling inflated price "pre-ban" hardware like a mad game of hot potato, speculating whether or not the 1994 ban would really end.
What about the pristine Mosin M44 I bought over ten years ago for $65?
https://www.flickr.com/photos/73437721@N07/20030130186/
Am I immoral for selling it at current market rate?
Is Auto Ordinance immoral for selling a long barreled Thompson for $1400 and the same firearm as a SBR for $2100?
It's supply and demand. If you want a FA, then find a way to get it. If FA is that important to YOU... Pay for it, or work in a capacity where you're allowed one. Some people decide to break the law to obtain a FA firearm. I don't condone them, but that's their dumb choice to make and they may get imprisoned.
Me personally, I have a value I assign to the toys I want and a budget to work within. I choose my toys accordingly. During the AWB, I wanted an "assault weapon". I discovered FAL mags were $6 each and milsurp 7.62 NATO was cheap. So I built an FAL. I legally scrounged up my own battle rifle.
I personally don't value an M16 at $15,000. I have an issued one, so I can make an honest appraisal for myself. A higher rate of fire isn't worth the extra $14,000 over a standard AR, especially given ammo costs. My decision to make for myself.
My truck gets 12 mpg. That figure may make someone here sick. Tough beans, it's my decision, not anyone else's.
People can make their own choice and have their own opinion. They aren't a "liberfool" for it, in fact, the one pressing their belief system onto someone else is more of a "liberfool".
So my opinion is that (1) yes the prices of transferrable firearms are inflated for what you get, and (2) no it's not immoral. My opinion to have. God has a right to judge me, everyone else, not so much.
My opinion is informed, and congruent with the free market & current legislation.