Theo R Cwithin
I cast "Baconstorm!"
For me it's not necessarily the advancement of, but rather the change in a PC over the course of a campaign.Is advancement integral to your enjoyment of playing an RPG? If it is how so? If you never advanced would it be fun?
Level advancement (or similar power-ups) is just one kind of change. Gaining the knowledge about the world and the campaign arcs is another that I consider fun. Making an impact on the game world through amassing a fortune, running a stronghold, discovering artefacts, making contacts and other such in-game occurrences not directly tied to levels are also things that I think are enjoyable in an RPG.