Ask HN: Advertising based business
Is it possible (in current economic conditions) to build a sustainable business which derives most of it revenues from advertising?
Also, at what scale/user base, assuming minimal cost structures (no marketing/distribution/engineering costs)
Yes- it is absolutely possible to build an ad supported business in the current economy. The key is to focus on a niche with a readily monetizable and under-served advertiser base for which you can be the best source of new customer acquisition.