Yes it is true more than half of those who gain there PPL - give up flying completely within 2 years.
Here for it's worth (come on it must be more than tuppence)is my opinion why.
Anyone who takes their trial lesson and goes on to complete their PPL does so for 2 reasons, they want to fly as a career (the bug got them) or they become addicted. obsessed, determined to get to at least their PPL
Flying is expensive and there is a lot involved to keep and maintain your licence.
The other thing is the very quick loss of currency in skills if you don't fly frequently, interpreting TAF's, METAR's and NOTAMS', navigation skills, landings and R/T work - all this leads to I'll put it off to next week when the weather is better
I do agree with nooodle though - it definitely hlps in attracting the opposite sex! - where's that wicked evil grin icon!