explain what a credit is used for somewhere extremely obvious.
I joined RhinoSpike to help others and I have no idea what these credits I am accumulating are used for. I clicked "credits" and it talks about purchasing them. Why should I purchase something I don't know how to use?! I'm sure I'll figure it out, but seriously, try using your site and assume that instead of "credits" you earned "fargleblargs". Then try to figure out why and what "fargleblargs" are used for. There is no prominent FAQ nor explanation of what they are for. Checking the KB, I see just two unrelated pieces of information. The UX is a bit lacking here -- whoever designed the site assumes that I already know what to use my "fargleblargs" on.

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stephenmac7 commented
Seems to me that they help your recordings rise closer to the top of the queue. They are also used for downloading audio, which makes nearly not sense to me, because there would be almost no reason to have these things recorded if you can't download the audio.
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Brett commented
Good point. I'm a relatively new user, and I deduced that credits can be used to download mp3 copies of audio recordings so that you can listen to them offline. It would be nice if that was more clearly stated, however.
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jon commented
Agreed does anyone know what these are?