Reason #127: Because of LDS teachings about prayer
Joseph Smith taught that all forms of prayer were ineffective if they were not couched in the format of the LDS Prayer Circle in a Mormon temple. Explore the evidences for this claim, as well as the contention that this practice was Gnostic as well. My friend Janis Hutchinson has done an exhaustive study on this subject, and you can read it here. Provocative, highly documented, and startling!
For more information, see The Mormon Mirage 3rd Edition: A Former Member Looks at the Mormon Church Today(Zondervan, 2009). Also available as an audiobook and as an expanded-text E-book for Nook, Kindle and other reading devices.