As a Priest myself who buffs Almighty 5000000 times a day Ima give you a few tips.
1 ~ Most (not all) Temps are stuck up and have a god complex. Trying to get buffs from them is like tryin to win the lotto. (Here I suggest you make friends with a few temps/ Join a guild and met people. (People are less likely to buff randoms)
2 ~ Dont even bother tryin to ask for buffs from a Temp or Priest if they have buffed themselves with "Chrono" (In case you duno know, its a pink buff that looks like a clock). This buff is there for a reason (Reflect/ Obligation)
3 ~ Again, you should avoid asking someone to buff you if they are pvping. The Chrono thing factors into this again and your asking for a buff/s will not only mess up the chrono but can also be a big distraction, and those few seconds taken to buff someone can make a huge difference in pvp. Buffing random peoples during pvp has caused me to be killed countless times/ lose my concentration and so on.
4 ~ Troll around Lime/ Ahkma and get to know people. Be friendly/ say hi and chat to people. Let them get to know you and you will see that it makes a world of difference.
We aren't all a$$holes in this game but there are many factors as to why some1 cant/ wont always buff you.