I had a small product on the market in the 90s, I had a few working protoypes that won "inventer of the year" and that attracted a backer.
I was never really interested in the finances, but I'd say whatever you've spent now is about 10% of what will be required to make it a real product. And probably 20% of the total effort depending on the nature of the product.
How could you hire a company or a factory to build this for you?
Yes you can but it ain't cheap for small qtys.
See this threadhttp://arduino.cc/forum/index.php/topic,53975.0.html
Maybe Udo will be willing to share his experience.