Tbh. potential less than All-Star is utter trash and its not worthwhile training those guys
I think star potential players are a bit underrated. I've trained a PF/C close to his cap
(21038334) and he went for 396k. He is retired now, but IIRC he was good enough to play in D3 USA. I also trained this SG,
(17743107) and he went for 400k. He is starter potential, but that's an argument for another day.
GM-hrudey is another manager that has utilized star potential players well. Before he started tanking, he had 2-3 star potential guys who contributed to his rise from D4 up to D2.
It is your opinion, however, and I respect that.