The problem with rewarding people with DKP is that you gradually start that step towards inflation, which is an admittedly inherent problem in DKP.

I'm of two minds on the matter. One, as someone who is always ready on time, prepared, at the summoning stone when invites go out, and who researches the fights ahead of time and engages in a lot of theorycrafting, I do get a bit upset when people are late, don't come specced for raiding, obviously bought crappy gems to get crappy socket bonuses, and didn't come prepared at all. This is compounded by the fact that I know that some of these people are competant players but they're just being exceedingly slothful. Sometimes I just want to say that we should stick it to the bastards or find people who will value their slots in the raid more.

On the other hand, I see the power of positive reinforcement. And I do believe in helping people to be better players -- for their benefits and the raid's. However, it's hard to provide unsolicited advice. Just look at this thread: how many people denounced raiding because the article mentioned docking people for not having the appropriate gems equipped? In WoW there's this huge feeling of entitlement, as if by having paid their fifteen bucks a month they should have the right to do anything they want. However, believing that and living by that creed means that they're probably ill-suited to raiding anyways; raiding is a team effort, that requires each individual to be knowledgeable, prepared, and somewhat dedicated to get positive results.

And, really, what better reinforcement can you get than downing a boss for that first time and handing out the loot?