If I could create a custom party, I wouldn't be interested in respec at all. It's one of those things that takes you right out of the game. Withers wants 100gp that will just vanish in order to what? It wouldn't be that much more work to take respec away in Tactician and only allow it in Story Mode (and just make it free because, really, who cares?). Players can easily change Difficulty to respec (and if you are changing difficulty, you're already giving up on immersion to some extent) and those who stay on Tactician will be able to avoid seeing one more thing that makes no sense in the game world.