My first thought at the prompt of 'Comfort' brought to mind the tendency of some in the hobby to find a system and stick with it, no matter the relative merits of the system. It might even be the first system tried- for some, there is that tendency not to stray from the system. I know that when I first started, I dabbled in several areas- from a start in AD&D 2nd Edition, I moved on to Marvel FASERIP and GURPS, adding Rolemaster once I went to college. I think that's one of the qualities I like about role-playing- the ability to get a different feel just by switching to a different system. Though I still buy and read a lot of systems, thinking about it I've seen a pattern. I'll have one primary system, and adapt everything to that system in order to run it more comfortably. I suppose that's no different than the gamers who stick with a particular system- my loyalties just switch from time to time as my sensibilities change. But, even for that, I still think that I'm more willing to try new things than most.