It doesnt always. It is based on the previous 3 days average of the price of Steem.
Therefore, if the price rises during the 7 day period, the value of your posts will increase, however, ifnthe price of Steem falls, so will the value of your posts and comments.
Sadly, the price of Steem has been falling recently!
I hope this answers your question. If you search the Steemit site, there are a number of posts explaining how payments are calculated.
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