No, actually. You equate casual with unskilled. Casual means we don't take the game seriously, it doesn't mean we suck. It often means that we already beat the game in a previous expansion and cant go through the headache of raiding 3-4 nights a week.

So, for us, this is like cheesecake where you can eat it or not and its all win. There is no downside to this at all.

If you are in a guild that's not ready for that boss, then sometimes the gear is the issue, but alot of times its not, its about positioning and execution. I remember a guild that went from kara to illidan in a month or so, and they downed him with some people in blues. Its about skill and hard work, not gear, as there is no way to field 25 guys/gals to T6 in a month (or really just a few weeks) of trying. Yeah, your tank needs to be geared, and the healers need to have something, and the dps can not slouch, but SO MANY of the bosses are 'don't be stupid and do X' mechanics (ie KT); when you master that, the dps isn't critical.