Nobody wants to use it? Bullshit! You need to make people want to use it, and show them that you have a great product to sell them. I think this product has a lot of potential and I'm interested in trying it out. I'm going to show my supervisor this later because if this could be adapted for more than just invoices (say; medical forms) then this could be a contender for an automatic routing system we and many other hospitals want to set up.
The one thing that stops me giving up on it is that I use it myself, and find it useful... it's been great for tracking my own invoices. Drop me an email if you'd like to discuss it further: davedx@gmail.com