I'm trying to level Persuade and Barter on my MC. It seems like your avatar gets some free positive attitude with shopkeepers that is lost if you switch to another character to barter. I'm only in Act 2 and I have 2 points in Persuade and 3 in Barter (1 from a quest), not counting points from gear. I'll probably leave Barter there for awhile and level Persuade up as much as possible from here on out.
Without spoilers, is this feasible?
