If you have to ask the question, maybe you need to reappraise your desire! For me, flying was a childhood desire, which 32 years later I am almost about to realise.
I am looking forward to the obligatory "take the family up" and go nowhere scenario, and the fly down to the coast for a day, but above all holidays abroad take on a whole new twist with a PPL.
If you love flying, that should be all the justification you need.