I know how disappointing something like this is. It’s not like the old days where software would come in a box and on disks/CDs. You could just up and sell that sucker like nothing. Nowadays, with everything being digital, the illusion of ownership has been dispelled.
Software developers have since become quick to remind us that their software isn’t actually sold to us and never was; We were only buying a limited license. SO, technically, even if you have a perpetual license, your ability to resell might be restricted much in the same way as if you had subscribed instead. (I vaguely recall instances where ADSK would aggressively complain about users trying to sell their unused, old licenses. It’s a thing, I guess.)
FWIW, if you’re a Blender user then you might also want to look into Garment Tool. It’s not nearly as robust as Marvelous, but the concept is pretty much the same. Create a pattern. Stitch it at the seams. Simulate. With enough practice, you can actually come up with some convincing outfits that include ruffles, pockets, cinching and so on. It’s really quite good for only $54.