Fro77,
Not trying to tll you how to run contest...just tossing out the suggestion...that you should limit each poster to one post in first 150.
Seems that with about 25 of the 150 posts, the winner had a huge advantage over most(if you randomly chose a number from 2->150) of the other entrants.
Also prevents the opportunity for another 24 or so members a chance to enter.