There is a fellow who practices it in the demo adventure "Tax Man Commeth" and a rather powerful user of it in the upcoming Blood over Gold is one of the antagonists - Illnypas the Thunderman really shows what it can do in the hands of someone unfettered by morality or, indeed, sanity.
One reason to use it is to allow one to use a myriad of common magic as active abilities. And some people are just unsuited to organized religion or community service. Self-rock allows them an outlet for their magical abilities. Another is that it allows the use of all four types of magic, so long as they are Common.
Jeff
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