One of the hardest things to do, once you have your PPL, is keep yourself inspired. I was given a copy of 'Progressive Flying' for my birthday, which has useful ideas for how to push your envelope, gain experience, pay for your flying & generally improve yourself. Just flying round the local area, or even bumbling off to another airfield for lunch isn't enough to keep people motivated. Think how tough the struggle can be to get the PPL in the first place... It's a very steep learning curve and consolidating that, despite its importance, doesn't seem to be enough of a challenge for some.