With Guildwars however, there is another problem.
While powerlevelling and gold do not really apply, there is "running".
In Guildwars Prophecies, the player has the freedom to go anywhere in the world they like, they are not limited to the storyline. But, that means that you can go from "Ascalon" (the starter area) to "Droknar's Forge" (an end-game area), you just need to be good at fighting enemies as the path there is long and hard.
What runners do, is allow five people into their party, who pay them gold, say... 5k for example. Then, they simply travel all the way from Ascalon (well... Northern Shiverpeaks) to Droknar's, taking the five players with them. These five players therefore have access to the end-game content without doing most of the game (Kryta, Maguuma Jungle, Crystal Desert).
They fixed this in Guildwars 2 and 3 however, but this then limits the player to a linear storyline.