Glenn has nailed it there on the last line, because the reason we become pilots is to impress the girls right? (Or blokes for the ladies)
Other noteworthy points, without a PPL you wouldn't be unable to wear any bars on your solo nav's
And you would be unable to say that you are a pilot every time someone said hello on your morning walk of 30+ min 3 days a week that you tell CASA about each year.
On a serious note ild sit it, it's a nice part way achievement to keep it interesting if nothing more, personally I've never used it but was worthwhile.