The difference is that it becomes a simple case of home copyright infringement, which under US law would fall under fair use anyway. Nobody would ever know.
If you mass distribute them then it's a more serious crime and it's very easy for people to find you. In no way can it be classed as fair use.
First we are talking about a "legal" way for anybody to obtains disk utlimatily. Though I don't know if that will ever happen.
Second, you are telling me to break the law. Ok, fine. But you are telling me to pay someone to then break the law. Why would I pay money only to the break the law? Why not just download them them?
The other part is the disks on Amiga Forever are not all the same as the original Commodore disks. So if I am using the images to repair an original disk that does me no good even if it was 100% legal. Again, no one gets this.