Not sure any player is worth 10m alone. That said, I think the only thing that would ever fetch that price is combination of complete uniqueness and versatility and probably has to be ATG to reach the types of builds I visualize for that heap of cash. For me, I would require a build something like this:
JS 10 JR 10
OD 19 HN 15
DR 15 PA 17
IS 10 ID 18
RB 17 SB 14
145 TSP and only about 201k salary. Would be a great defender, able to defend any position, and rebounder. Not much of a scorer but should make up for that as a playmaker and isnt a complete liability. I see his best use at PG offensively and then using his versatility defensively to switch off to wherever you need him given your opponent.
Not sure that many TSP is possible or how this guy could ever exist as I've never attempted it in a training simulator but it's definitely unique!