Personally, I don't mind buffing players when requested politely. Ask me, "Would you have a moment to cast a few buffs? I'd be happy to donate for your time," and I'll almost always give them everything I have. However, "buff me dud3" will get no response from me or a best a response of "Very sorry, but I'm busy at the moment."
However, seeing 3 tells from random people asking for buffs upon zoning into PoK gets tiresome. I'll look around and if I can see them, I'll buff them (assuming they were polite). If not, they are usually out of luck.
When I play one of my alts, I will only ask for buffs from players that I can see (never use /who) and will usually say something like, "Master Shaman, would you impart the Spirit of the Wolf upon me?" It is almost never denied and usually followed by several more buffs.
I'll respond in return with a /kneel and "Thank you kindly, Master Shaman. May this donation help you better serve the greater good of... <insert guild or starting city>." I've actually had a 70 Shaman I know (although he didn't know it was me) rebuff me several hours later when he saw me runnning through PoK again. He asked me how it was going and told me he appreciated my politeness.
Courtesy and politeness go a long way in game and in real life.
My two cents.
Mojo