You are probably wondering about the current increase in post payouts right now but posts value is defined by 3 things.
1) The SP of the voter which controls the amount you get
2) The price of steem which can drastically change the vote value of people and it tends to be the main influencer.
3) the rewards pool, which is what is increasing the value of posts right now.
This increase in value is happening because the reward pool was left basically unused in the days after hf20 when steem was unstable and everyone VP went down to 20%. The reward pool is forcibly redistributing it's content right now so that it gets used more, think of it like a happy accident that will reward you for your constant activity :-D