There isn't a point, taking naked pics of yourself is dumb and pretty pointless... taking them when your a celebrity is even dumber lol
Even celebrities deserve some privacy. These pictures were obviously taken for a very specific person to see. If that is their kink it is their right to do so.
It was not a vengeful ex but some random person none of them knew that violated their privacy.
Imagine having
your kinks, fetishes and weird habits or bodily protrusions visible to all you know and being judged.
Your love of bondage, gay midget porn or your insistence on having one hand on your SO's breast and the other on a HHKB and not knowing which you prefer more...
*Coughs* 
Would I ask for nude pics or send **** pics? No. But there is a certain thrill and mutual trust in sending one or receiving it from someone.
And for some reason I don't think it is that rare anymore for the generation that grew up on cellphones.
I myself am just slightly too old to be fully part of that generation, I even remember when we first got internet and didn't regularly use it until I was 16 or so.
But the current 16 year old probably doesn't know any better than that they have always had access to the internet and a cellphone that could send messages and make pictures.