I don't understand the shock and outrage.
Before I begin, I'm a long time MOS user on a Peg 2 and have never used AOS 4.x.
But, Trevor can charge what he wants for it. My gosh, be thankful he even dedicated the time to this project. You have multiple selections of hw to run AOS and the high end offering is priced more than most can spend, then buy a SAM.
I don't know Trevor or the business side of what they do, but I would bet that he would have to sell quite a lot of 1000's until he broke even in this. He can't go mass production, since the community of Amiga is so small and divided.
Again, I will never be a user of AOS 4, but let the man set the price of his stuff and let it be. I hope that he does well and sell lots of them.
Good luck Trevor and crew...