Jeff,you need to sell through Amazon or Barnes and Nobles as much as possible. Publishers pay attention to sales recored by these stores,and have no way of knowing how well your book is selling out of your home,or that there is even any interest in it. The name of the game is "public exposure". You need it if you ever hope to get a publisher.
It seems to be getting some exposure, mostly word of mouth. I believe the current ranking on Amazon is the right one now (rankings of 6000-900 earlier today were skewed I believe) and it's resting at about 44,000. Up another 7-8000 in the last two days.
Hope it keeps going at that rate.