ok ode, here's a lesson from someone who just finished 2 semesters of business courses based around technology products:
To sell your product, you have to let people know what it does! So far you say "buy it and I promise it will be great" That's all well and good, but to be honest, I dont trust you at all... why should I? I don't know you. I'd be leary even if you were trying to sell me this through personal selling, but that fact is that you are doing this on the Internet, which is highly susceptible to scams and very hard to show "honesty."
If you hope to sell ANY of these, you have to give us information. How can a parallel port device NOT need drivers? Shouldn't it have to use some driver, as per the parallel port specs. How many buttons can it use exactly, not "yeah, you are kind of right." How exactly can I add more buttons? Why can't you tell us, its not as if we are going to grab a breadboard and start soldering up some competition.
I really don't mean this to come off mean, but seriously, you need to give us some more info. No one will buy a product based on your "guarantee" that it will work, especially seeing as you have zero credibility on these boards.
With that said, I am sincerely interested in your product. I'd like to know if it works, and what it can do. I will NOT, however, be buying one without more information, and I'd venture to say that many ppl on this board feel the same way. I hope you take this to heart, and don't think I am just bashing you, because that isn't the intent.