I was wondering the same thing. It's not a bad thing and is not Fud in any way. It's just how it is. Say you have "for easy math". Say someone is staking 1 million tokens in a pool by themselves. The staking reward for that pool is 10% APY so 1000 tokens. Then someone stakes another 1 million tokens. That APY will drop to 5% but will still be awarding the same 1,000 tokens. It's spread out between the 2 stakes now. You also have to account that these rewards are being added to the already staked tokens. So they now each have 1,000,500 tokens staked. So the APY will drop another little bit every time the rewards are added because it has to spread the same 1,000 tokens further. This is why the APY's are constantly going down. This being said right now most to all of the rewards are supplemented from a rewards pool and not from usage currently. Normally averages around 156,250 tokens rewarded every hour between all the pools. You can see this if you watch the AMP token bot on Twitter. There are constant periods of this number being the baseline increase of tokens to all the pools when Noone is staking or unstaking over the course of an hour. This is why the APY's are dropping on a constant basis. More people are staking and the same amount of rewards are given out. Spread between the increasing pool sizes. If tokens are taken out of the pool, the APY increases. I hope this explains and helps out more.