As mage, go camp in a major city, where Pilgrim event is taking place. I take UC for example.
Then, you simply yell that you sell portals 10g each and people who wants to trasport for quests or for cooking mats will select you!
You can also change the city every 30 minutes and find new customers or make portal packets (like 5 portals or portals for a day) that will make you look more proffesional and trustable.
You can also apply my AFK technique. Make a macro that advertises your deal every 3 mins for example and open fish or farming bot that warns you for every whisper, so you can alt+tab and play TFC at the background
twocents