Yeah you are right. Charging is the best way to tell if your product is really providing value to users. I have been putting it off always wanting to add more features first.
Honestly. "Cool new things" without some sort of pricing have started to scare me. Either A) I'm the product or B) SURPRISE! The cool new thing now costs absurd amounts of money.
Sure, I like not paying for things (if I don't have to), but if I start to use it and really get into it... if there is no clear monetization... it gets a little scary. Plus if I'm really into it, I want to support it. Some of my favorite apps are solo developers or small time shops (like Inkdrop)
The topical subscription is pretty cool. I'm sure I could hack together some kludge (like Google News filters or something), but if this app's implementation is easy, I'd pay for that.
