The dataset used for mining charts is from Palnet launch until 07-07
Total mined PAL in that period of time: 14012 PAL
If you think mining with digital tokens is not profitable, I can tell you that the top 2 PALMM holders, @bitcoinflood (55 PALMM) and @aggroed (40 PALMM), made around 14-22% in a single month. @videosteemit (15 PALMM) made more than 10%. Late miners have fewer profits, but APR is still very positive (with the actual price of PAL). % of profits calculated from the actual number of staked PALMM, they probably didn't buy that many miner tokens at the beginning, just buying up later to secure profits.
Visible little change between 3 and 4 July - proof of moderation rewards.