Some fan bases tend to be loyal. Country fans are one, and I'd say rock fans are another. On the other hand, some fan bases aren't very loyal. Mainstream top 40 artists have this problem. Big one day but they can't keep up their popularity. Sarah Mclachlan, Jewel, Sheryl Crow, and Alanis Morisette are a few examples. More recent examples would include Christina Aguilera, Hillary Duff, and it appears Avril Lavigne. Why is it that some fan bases are much more loyal than others?