Personally id rather give someone gold when they "need" it for a prof even if they dont than most of the people who go crazy asking for 10s.
LOL, 5silver I constantly begged on my main if anyone here know zenong from cenarius and got over 100g from 2hours of begging.
never whisper someone you should just try in general.
just say that your buying an epic from a friend and you friend has to choose between you or someone else and you need the money now and you will pay back with intrest.
if you make a party with someone and your in ironforge and hes in stormwind for example you have 2 options: tell him to send only the money without anything else or very important never go to his city always tell him to come to you.
...oooor, you can borrow alot of gold from your old guildies before moving server.