Suggestions:
It seems that many are driven to post up their hard work and success in other forums in order to get recognition and a "pat on the back" by other members of the forum. Maybe you could allow commenting on the HAC, so that posters who take the time to write up their year step by step, and include pics along the way, will get a "pat on the back" from their buds on the forum. That would be a motivator in my eyes.
Another suggestion is to do a 1st, 2nd, and 3rd prize at the end of the year for the best HAC threads, (it is possible that this is already being done and I have not heard about it). If that is the case maybe advertise more about the prize.
Those are my thoughts.
}}-SLIVER-->