WTF is wrong with you people? 10-15g is the STANDARD tip for any "service" someone provides for you. You can get that gold from doing ONE stinking daily!... I've been giving that amount for services provided (ie Flasks, Enchants, Tailoring enchants) since BC. How is getting the time saving "service" of a portal any differant? It's just a common courtesy. Is gold REALLY that hard to come by you cheap fucks.
And Mages... If you are charging more then 15g for a port you are a greedy scumfuck and deserve to be charged over the top prices for any "services" you buy from other players...