High gas prices probably don't help the situation. I doubt most people are going to run out and buy a new gas guzzling toy right now.
You just have to find the right person. I tried to sell my previous boat (not an Allison) for two years. Only offers I got were so rediculous I had to laugh. Then after I took it off the market and had made up my mind to keep it, a guy that I knew through the tournament trail I was fishing totalled out his boat. He had insurance check in hand, called me on a wednesday night and said he'd give me what I was asking for my boat 6 months ago. ONly catch was I had to meet him the next night as he had a tournament on saturday morning.
Dropping the price is always an easy way to get more bites, but you have to decide just how bad you want to get rid of it.