Marcik: I hope you fully understand that your browser will be pirated as hell - just like IBrowse. Sure, many here say they will pay for it and well, maybe they will. I highly doubt you will ever get much more than the bounty will be at completion of your project.
Bailing out now, changing the terms and shit is plain stupid.
Never underestimate piracy. All commercial Amiga and MorphOS software the last years have been pirated. The groups are just waiting for releases.