Sweater Fiber Content change?

by Vera Campbell

I bought my Ravenclaw© sweater last year and I absolutely love it.

With the depressing news that WB, out of love of their pockets and not their fans, have moved the HBP premiere to July 2009 instead of November, I was thinking of ordering a vest to deal with the heat, but I notice that all the sweaters you knit now are out of acrylic yarn and not wool yarn.

Why the change, and is it possible to get it in wool instead?