At least, blu ray losses were lumped together with PS3 losses iirc and the mistakes helped Sony make PS4 into a great success. Still, ouch.
I wonder why PS1 was more profitable than PS2?
Yes, the PS3 was lumped with other products that were losing money, mainly because the PS3 started to become profitable, so it offset some of that loss. So, we'll never know how much it truly made/loss.
Based on the data I've collected up through this past May, the PS4 was at 29,413k in the U.S. This means the PS4 sold at minimum 587k in the June-Aug. period, meaning a minimum weekly average of a bit over 45k. Last year, sales in the same period were 761k, or about 58.5k/week. This means the drop for the June-Aug. period was no more than 22.86%, comparable to the drop for the Feb.+March period (January was not down much for no obvious reason, while April and, to a lesser extent, May were down a lot because 2018 had God of War).
This also means the PS4 is so far at over 1.6M for the year, maybe a bit more, vs. 2082k for the Jan.-Aug. period of 2018. Assuming the average YoY drop remains about the same, the PS4 will sell 3.3-3.4M in the U.S. for 2019 as a whole.
Can you at least continue with your graphs? I mean you might estimate those monthly sales, or just lump those months together.