Seems you have a 5 year old projector that is worth less than the replacement bulb for it. These type of video projectors do not keep their value for very long. My suggestion is to start off @ $150 and hope someone will consider buying it. You have 2 things working against you on this.
1) The bulb is good for only so many hours and if the life of the bulb is close to that, no one is going to buy it.
2) New media projectors even though are far lower in picture quality can be bought for a few hundred dollars so why would someone buy a used one even though yours is designed for home theater?
I know its not what you want to hear, but this way you understand why there is so little demand for it.