Thanks for the response - very useful info for future characters.
Free generic points seemed to good to be true, but I couldn't figure out what else the 750g could be adding to an already learned and unlocked tree.
So out of curiosity, what are the multiplier values we're talking here? I was thinking I'd read that you should never learn the tree from an escort quest because it gave you a lower value than buying it from the trainer (0.8 vs 1.0, I think). But is that 1.0 (if that value is correct) before or after the 750g expenditure? If the 500g gives you the 1.0 multiplier, what does the 750g take it up to?
Of note is that if before paying 500 gold, you learn one of the talents in the tree without learning the category from an alchemist escort, results in having 0.1 higher talent mastery than you would otherwise.
That's for the entire tree or just the talent(s) you selected individually? ...Though, as a typical staff user, I'd assume the overall value of this is probably unlikely to ever be worth passing on the +2 magic reward you could have instead.