Why is there an advertising inside the billing module?
I would rather pay a small annual fee than have ads inserted into a billing system. While companies try to make their billing boxes as safe and secure as possible, third party modules have ads injected into it. I cannot even start to mention how insecure that is not to mention privacy issues. Plus, it does not look professional.
There should be other ways to make money than relying on adware inside an accounting or billing system software. If you want more companies to adopt the reporting service, I would suggest not using ads or external links inside the modules. It gives me a bad taste and feeling.