Unless you plan to never succeed at a charisma roll, yes you do. The game is absolutely filled with charisma checks. You can argue all you want about the potential merit of outcomes from failing rolls, I do NOT give a flip, I do NOT plan on failing every roll...in face I plan to give myself the best chance at succeeding. Really unhelpful topic. Charisma is *the* singe most helpful stat outside of combat and if you pick your class right is can also be the single most helpful combat stat for you as well.
I think I'll stick with the F5/F9 stat instead
