Unfortunately, the pap is only seeing dollar signs: tabloid style papers/mags/tv shows/ and online sites, pay good money for sensational celebrity shots, no matter how crappy the pictures are. Getting a pic of Britney in the ambulance, even if it is low quality, will probably fetch big bucks. It's a crappy situation and gives photographers a bad name (especially the white lens/ super telephoto lens users... put a Canon white "L" lens on your camera and people are quicker to think you are pap, instead of a photographer actually out there shooting on an artistic level and are not into stalking celebrities).
The pap feeds off of Britney, and Britney willingly feeds off of them... it's a vicious cycle.