I also do not have the math to support my suspicions, though I would love to see it. If one point of mind is one point healed, it would actually be three points healed per point of mind if you were getting a crit on Adlo, the main Scholar heal. As competitive as people are in end-game content, you will essentially always be the lowest of your class in the parser if you never invest in mind or int.

I don't think the game supports playing both SMN and SCH very well at the moment. If you're interested in being competitive and being "the best you can be" for end game content, I would pick one or the other, or buy the 10000 point Grand Company stat reallocation tomes before you switch between them. I suspect this will be more and more of an issue for everyone else as new Jobs are released, unless they always released a new base class along with a new Job.

If you don't mind being permanently in last place, or if your free company doesn't, then I say go for it and pick Vitality...