Thanks for the mention! (I'm the founder of Blogalia :)
IMHO, greaterskies.com is interesting as a project, but:
- I don't think anyone will pay for simple visual star charts: there are free sites, free desktop programs and free tablet/mobile apps out there.
- If not for visual, but deep sky: there is 3Atlas from José R. Torres (9, 11 and 13 mag sky atlas): http://www.uv.es/jrtorres/tools.html Available for free in PDF.
IMHO, greaterskies.com is interesting as a project, but:
- I don't think anyone will pay for simple visual star charts: there are free sites, free desktop programs and free tablet/mobile apps out there.
- If not for visual, but deep sky: there is 3Atlas from José R. Torres (9, 11 and 13 mag sky atlas): http://www.uv.es/jrtorres/tools.html Available for free in PDF.
- The marketing problem: find your tribe! There are some forums, like cloudynights.com (or http://www.asociacionhubble.org/portal/index.php/foro in Spanish), but this are mostly for dedicated observers.
My 2 cents.