Find profitable audiobook niches for audiobook publisher

Hi,
I am looking for someone who can do market research for me.

I am in the planning phase for an audiobook publishing business and am looking for the most profitable audiobook niches. After all, you have to focus on something for a start-up.

Research should be split two ways: GERMAN-speaking market and international English-speaking audiobook market.
If you would also be able to split these language-based markets into fiction and non-fiction that would be perfect.
Outlook should be for the next 2-5 years.

I would also like to read your research, so all links, articles, references about where you found the information are appreciated.

And yes, I'm sure, experienced researchers like you are laughing right now, because the information is just a Google search away, but I am as good at finding something on Google as a chicken is with building a brick house.

This is NOT URGENT, so anything under 4 weeks turnaround time is great.
This project will be open for quotes for about 2 days and I will review your offers over the weekend.

I've looked at the Hourlies on PPH and have tried to base my project budget on that and the estimated time for completion it would take me. But if you feel that my budget is completely off, feel free to send your own quote and educate me. I appreciate the opportunity to learn.