A pot cost system that actually makes sense

From what I've heard, only rich magicians train with ultimates. Otherwise, they Paralyze+FD+Quines or CL+ID+Ifrit most of the time, only using ultimates when there's a large enough mob to justify the cost.

I'm curious where this is happening. Lol All 4th job mages I know, have seen or have heard about use their Ultimate for their training, almost entirely.