Because of my social bard/rogue, I'm able to get uncooperative government officials to become valued contacts who work for us instead of against us. I am able to sell our swag and buy new stuff for great prices. I am able to get ALL of the relevant facts about a person, organization, or location. I'm able to keep thuggish toll collecters from attacking us while we pass. I am able to get information from a victim traumatized by fear. I am able to successfully counter the effects of slander and spin them back to the accuser. I can skillfully defend myself or my compaions in a court of law. I am able to enter and function in high society, and even the social circles of a foreign land. People give of themselves to me; whether their time, expertise, or resources; without realizing it or understading why.
But I only made this character because I knew the DM ran a game world where CHA and social skills really matter. And it was clear when I was observing the party before I joined the game, watching them be harrased by government officials and watching them being slandered by an NPC bard, that they could seriously benefit from a very charismatic socializer. And I was right.