Hi there, thank you very much for sharing, it works a little differently though:

You receive all the refunds by being preferentially voted by idle members as part of the fair use policy, beyond refunding your votes it spreads the rest of the idle votes evenly among the group.

So if you vote a group member 5c, that is remembered and you get voted back on your posts till its recovered so that you're not spending more than you're getting back, maintaining a safely capitalistic environment on a 'best effort' basis with group dynamics.

Hope that clarifies it, please please don't expect a huge vote from the @schoolofminnows user when you've made some votes, your refunds come back to you as votes from idle members, so it happens across a few posts until it has neutralized your altruism and you are fully capitalistic again.
I actively encourage my friends to stay idle so that the group votes, since it is the fastest way I know of to grow on STEEM without paying voting services or lobbying for a whales support.

I call the algo 'proof of altruism' .