for it to be an investment, there has to be a big reselling market. which doesn't really exist, most of them are bought just once and that's it. e.g. this marketplace lists the primary and secondary sales of artists and the secondary market is laughable.
https://foundation.app/trending
+ there's no scarcity, I'm no expert, but to me it really seems like once you have the grasp of how you do it, creating most of them is a matter of hours or even minutes. many of the popular artists seem to be able to create 3-5-10 new works every day.
which is why the basis of it sounds like a phantom shipments scheme to me, the launderers pretend they're paying for elite artworks but most of the times they're worthless