When V100 killed its local quiet storm show, many listeners moved over to Jammin's "Moments in Love" show. Also, nearly all of the jocks on Jammin' use to work at V100 back in the day. Many of the listeners who have outgrown V100's format have switched to Jammin' and can relate to the Jammin' jocks they use to hear on V100.
Jammin' is also more visible in the community than V100. I think Jammin' organized an event called "the Gathering," and they also did the "Christmas Wish" promotion.
Just my opinion, but I think CC has hurt V100. The company cut the station's local quiet storm show, cut the local Friday/Saturday night mix show, shrunk the playlist, cut staff and made it sound just like every other CC urban station. Bring back the "V100 Jams the Most Variety" days.