The more books there are on shelves, the more will be sold. Once you get to the level of The Secret and have 40-100 copies in many stores, managers have almost no choice but to put them in prime real estate like front-of-store, end caps, or front window.
I think Charles Manson was a hair's breath away from just being a terrorist. He wanted to start a war, too.
The fact is most computer roleplaying games that offer a zillion highly specialized skills end up with nine-tenths of a zillion skills that every player quickly realizes aren't worth the experience points to buy.
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