Now I don't mean me personally but ask yourself this question, what's in it for you? You get your guild group together at reset, rush through the raid wings in about 3 hours and then you are done for the week, no more rewards, you are capped. You see guildie after guildie ask in chat, you see pugs beg in map chat for a full party so they can even practice.... but why bother? You don't get any rewards for helping them, not even blues/greens, you get zilch. Maybe you can join the raid sellers instead, at least that way you get gold and others can get their raid done, who cares if they understand the mechanics or learn anything, what is important is that you make money. If only there was a system in place where you got extra loot if someone in the party completes their first clear of a wing, that could be incentive but that doesn't exist. You get nothing, why bother?
Maybe I should pose the question to the GW2 Raid Devs instead? There is only a small numbers of players that complete raids weekly and everyone else has to suck it up; the current system is flawed, especially when you consider that the only constant day to day is raid sellers in the LFG tool. No issue with raid sellers mind you, they are just filling a gap that the devs have left wide open. GW2 Raids have an artifical barrier built in that makes it harder and harder for the casual player to experience them, if you don't have 100 kill proofs then you cannot join but they can't get a group so they cannot join, it's a catch 22. This isn't a topic on the difficulty of raids by the way, just the lack of rewards for everyone. It's a minority of players that do full clears every week with the vast majority of players not able to find groups and it has nothing to do with their gear or skill levels, plenty are able for raids but if you don't play by reset each week, then you just don't play and that is the reality.
Update: The emphasis of my post has less to do with rewards and more to do with a flawed raid system that cuts off 95% of the playerbase by it's design, not by player choice.