Just experienced it yesterday. I was solo ABing at mid TI, and EVERYBODY just threw themselves at the mobs. My SP was somehow stading because of the Royal Jellies. I even ate my 3 Ancillas... I had to file a complain at Gramps office...
EDIT: forgot to mention. Thanks to spotlight (double exp AND increased spawn rates), Dark Priest seems to be the best leveling spot until late 110s or early 120s... I'm at 110 now and I receive more than 10K exp per kill, the jexp sucks, but I simply use the BBs to compensate. I can even use Leaf Cat Hat and the chance of death is ~0, even with incredibly large mobs.
are you talking about 10k exp per mob? cause you should only be getting around 4374 exp per dark priest. i would think AK/khalitz/wanderer would be better at 110-120