Here it is Why they place importance on Number 8:
"The Power of 8
The number 8 represents the infinity symbol. The 888
configuration escorts us past all pervious limitations and into the
land of the limitless.
The number 8 represents our conscious connection with the divine,
material & spiritual balance, the merging of Heaven and Earth. - As
Above, So Below.
The number 8 represents abundance, manifestation, onepointedness
of mind, wholeness, strength, power, success, selfdiscipline,
achievement, entrepreneurship and leadership
The number 8 represents universal blessings.
In the Hebrew Tree of Life the 8th Sephiroth is Hod representing
Splendour and the procession of feminine potency.
In Greek mysteries 8 represented the higher mind and is a
variation of Jesus.
888 and is the sacred number vibration of the Christ.
The Celtic Wheel of the Seasons has 8 spokes Spring - Beltane -
Summer - Lammas - Autumn - Samwain -Winter and Imbolc
In China 8 is the number of Universal Good Fortune.
In Buddhism 8 means completion and all possibility
The Ba Kua has 8 Trigrams
8 is known as the "great balancer" - we reap what we sow."
http://www.thinkwithyourheart.net/The_Power_of_8.pdf