This product appears to be decently-executed, but the same can be said about most RSS readers. Frankly, this looks identical in both aesthetic and functionality to the dozens of other services that are attempting to supplant Reader. Feedly and Digg reader already offer this product for free. Fever, Feedspot et al. offer novel idiosyncrasies that cater to niche markets. (And "we want to be sustainable" is not a unique justification. There are a myriad of other services offering the same appeal.)

You've made a great product, but so has everyone else. Why is kouio unique, and why does it warrant $5 per month?