This concept could work, however, the legal documentation would be considerable.
I would say for 1 book, it would not be worth doing, however, a group of "investors" could start a "fund" in which the assets of the fund were high end comic books. Obviously, like any investment fund, it would need to be managed by someone who would have the ultimate decision on when to buy or sell a given asset (a particular book).
No, the individual investors would NOT get to take the books (the assets of fund) home with them. The assets of the fund would need to be stored in a secure location and insured.
There is a LOT that would need to go into making this work, however, it is possible.
The BIG question would be who to get to manage the fund. If it were my investment, I would want someone like @G.A.tor . Not that he would have any interest in such a project, but he would be the kind of man I would want managing it. Someone with his thumb on the comic market and MORE importantly, someone I could trust.