Reporting Services is mostly used in corporate environments. It's included with SQL Server, which means to buy your product, you will have to have a significantly better product for people to consider purchasing it.
Here are some other concerns
- Most Reporting services installations are on corporate intranets. Being able to access it through your website is a no-go
- You've identified that they don't display in FF or Chrome very well. Companies using Reporting Services are most likely using IE on the desktop, so they don't care about FF or Chrome
Here are some of my own pain points from using it
- It currently does not support multi-language reports, so it requires a separate report for each language (!)
- Deployment is a bit of a headache
- Each new release of Visual Studio is not compatible with old versions of reporting services projects - that's a development pain
Here is your competition
www.dundas.com
You notice their pricing is not on their website, I had a quote and it was over $20,000 for a 20 user runtime licence and 1 developer licence. Obviously it is a very mature and complete product.
I wish you every success. Have you got clients who are using Reporting Services and finding it a pain? Find out what their problems are and write something which fixes them.