Nah, haha. I'm a very casual player, but I still raid. Raid schedules are just to keep 10-25 people organized in an attempt to get them all to sign in at the same time, nothing more than that. We're 6/7HM (which doesn't say much after nerfs) but we're all still pretty casual for the most part.
It's all about someone's attitude. A casual player has a casual attitude. He likes doing well, gems and chants his stuff, shows up for raids but if you look at him and ask him to spend another 1900g on an enchant/upgrade/etc to get an extra 70dps, he'll probably laugh at you. I mean come on it's 70 DPS.
Now the more serious (or commonly known hardcore) player would look at this situation differently. Yes, it's only 70 dps, but when you're min/maxing, 70 additional DPS is an instant nergasm. It's a pretty big deal. That's just how they have fun
However, let's not incorrectly assume that a casual is bad or that a hardcore player is good. (Just for future reference
)