It was a practice in English magic for some time, and was most certainly practiced up until the 1600s. It was even practiced in some circles in the 1900s. It is also still a part of certain Hindu sects today.
The thing is with Wiccans, most people claiming to be Wiccan are not really Wiccans, just witches (and even then, sometimes that term is generous!) who happen to read bad material written from a twisted Wiccan perspective.
Sacrifice has an inherent part in many forms of ritual, as with most things, it can be substituted for something else.