I have a few toons on the RP servers.
Once I was stuck doing a quest mission where the boss was pwning me bad.
a lvl 40 Jugg was nearby and i whsipered to him "hey can you please help me with this boss I need to kill? just make sure I do not die, I dont need you to kill him just watch my back incase i start losing the fight bad"
His response: "I am sorry but my Sith jugg does not socialize AT ALL with non-sith species therefore it would break my immersion to help you."
My reply: "Look, I respect your immersion I just need someone to make sure i dont die this is pretty close it will only take literally 3 min of your time."
his reply: " my sith does NOT socialize with non sith. You are now on my ignore for breaking my immersion and devaluaing my gameplay"
I put out a help call on general. a few seconds later a sith sorc named "Twinkletoesandcupcakes" answered me and said "hey m8 I will be happy to help!" 2 min later he was there, stayed with me till I finished my boss, gave me some gear he didnt need and wished me well.
Point is, a LOT of rp'ers are total douchebags, while a lot of "f2p teens with non rp names" will bend over backwards to help you.