I've actually found that competing has blunted my enthusiasm for training in general -- spending 4 months training diligently for a day which ultimately isn't that great makes the whole experience disenfranchising. The forward-focus on competing gives more drive for every workout leading up to it, but the realisation that the day itself really wasn't such a big deal bursts the whole bubble, and I've been finding it's tampered my motivation in general. Having spent a year using extrinsic motivation (competition) to fuel my training has stunted my intrinsic motivation, so a lot of time this year has been spent going through the motions rather than pushing myself like I used to.