It just boils down to one thing. LAZINESS!!
Everyone starts out the same way in this game. How far and fast you progress is, for the most part, based on a person's real life traits, namely thier character. If a person has been given everything they want in RL, i.e., spoiled brat, then how can you expect them to all of a sudden change into a determined, goal oriented player? You just can't. I'm sure these players are nice people in real life, but thier character flaws show up bigtime when they know they're somewhat anonymous and don't care about anything but getting what they want. The people that get credits from me are the ones that I see willing to work for what they want, so I'm more then happy to help them out. The others though, I just ignore and think of what a better place this would be without them.