On the other hand, you may end up with people running the app that have no way to maintain/support it.
It looks like MongoDB is being used for fetch/push history, feed icon data, and article data. It's also being used for some other stuff: https://github.com/search?l=Python&q=%22mongo.Document%2...
I suppose I could also look at the source ;)
For the cost of hosting/development/work you are MUCH better paying for newsblur and forgoing 6 outside coffee's a year.
Er... really? My laptop is three years old and I run 150 threads on it every time I launch the server I'm working on (dozens of times a day). No problems at all.
It's in Java, in case it matters.
Also there seem to be a lot of stuff that need to be installed and configured that might not be necessary for single-user/<10 user instances. Yeah the 'fetching the feed part' still needs to be done, but I guess right now it is close to impossible for anyone apart from yourself to be able to understand how to do that.
Due to the mass exodus from Google Reader, I understand that NewsBlur has faced challenges in scaling and hence is slow. But things can only get better from here.
Since it in open source software, you should at least setup a getting started developer's guide so that you will get a lot more contributions from the community.
If you have at least fifty previous entries from a feed it's easy to predict fairly accurately when that feed will need to be updated again.
That's how the indexer for http://rssident.com works. Saves you tons of cpu cycles.
The real problem with setting up your own instance of NewsBlur is that you'll have to do your own feed fetching. This is effectively what you're paying for when you pay for NewsBlur. Let me break it down.
500 feeds updated once every five minutes is 144,000 feed fetches a day. Couple that with the original page and icon fetches, you're looking at almost two feeds every second just to keep your feeds up to date. And the average feed takes 5 seconds to completely update (feed, page, differences in stories, updating unread counts). So you have to run 10 processes in parallel, and that's already beyond the capabilities of most single machines. Then good luck keeping your DBs running clean and backed up.
Or you could pay $2 / month and never have to worry about setting up a very big stack. And you get the social community of shared stories on newsblur.com.