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That's the thing, going by what you said one could argue that it encourages spam because people are going to have to make posts to make sure they get paid a decent amount within a certain time frame.

yup.
If you want more of something...reward it.
If you want less of something...don't.

So you think it's a good idea to just spam pointless posts to get upvotes rather than come up with good content to keep up the payments?