As already said creating a "buff-mule" is not a beginners exercise. Apart from the boredom of sitting in PoK the returns are minimal nowadays. The only one that stands any chance is the KEI enchanter and there are so many people doing MGB KEI now that even that is chancy.
Nobody pays decent money for SoW or Shaman buffs. Virtue and Temp you are lucky to get the 10.4pp component cost back. I heard someone in PoK the other day shouting they wanted "free temp".
Given that these spells require level 60 characters (62 for Virtue) and that the returns are not what they used to be it is not the "goldmine" you might think. Once you have a character at that level anyway then the income is quite useful but if you notice most of the people giving KEI are doing it to fill time - before a raid, before they log etc. Unless of course you have a scripted buff-bot which can be left on 24/7 until it is banned.
Locations may vary between servers but at the right time of day you can stand outside PoK bank and get MGB KEI, Fo7, Bot9 and modrods.
Small hint - if they meant this to be a career path maybe they'd have called it "Everbuff".