Though by no means do I think the discussion should have to stop, I think I have come to my conclusions. The inclusion of social skills as a gameplay mechanic is necessary, because even if the player sitting across the table from me can give excellent reasons of why the dark lord should let the hostages go and take him instead, it doesn't mean that the dark lord should give in, especially if the character the player is controlling is a half-wit smelly orc.
On the other hand, I should still give conditional bonuses to their checks IF they do rp well, if only to continue to encourage realistic and immersive roleplay, instead of only roll-play.
I also wanted to thank everyone that posted in this thread, as everyone has provided more proverbial water to the water wheel of thought inside my head.