Wow, that is some serious improvement over any of my stock smokers! I have to ask, is the current drain much more than the standard one? My brain says, more smoke needs more juice.. but I'm a programmer, not an electrician!
As for how many, not knowing the market it's impossible to say, but eBay and/or Mato would seem good places to market them through. I think you'd sell quite a few to the residents of this board though [X(]

Price.. hmm.. that's a tough one, as I have no idea how much they cost to make. How much are you willing to sell them for and make a decent profit?
I guess I'd pay £20'ish (double it for US$ ) without a thought. Might pay more if I had the spare money and fancied making a lot of smoke. That might be a rediculous price and half what it cost to make, but that's my threshold to buy one without further "thinking it over time".