Magic Forums

I've read that your not supposed to look at the moon while casting a money spell, as it would make the money go in the opposite direction. What's the reason for this? My source for this information is the book "Wicca: a year and day in magick, the complete beginners guide". I purchased this book because I had heard good things about it, and even though I haven't read the whole book yet but the information about what Wicca is, who the goddess is, and who the the horned God is, are all correct. When I cast money spells I don't look at the moon anyway, I'm just wondering why your not supposed to. You know, aside from your just not supposed to.
Thanks