Sometimes, if you start game just to build/gain your days bonus then exit (lets say fourth day, but exit while the auto save is flashing in bottom right corner) it doesn't actually save it.
You fire up next day expecting 200%, play so save takes hold, you're actually on 170%.
I'm positive you get the same result if you do this: start game, ok to bonus step screen, quit while auto save flashing, return to XMB still logged in to PSN, leave PS3 on, start game again later. You will still be on your original bonus (but you thought you okayed bonus earlier didn't you?), but if you don't eyeball it, then the next day is where the confusion leading to conspiracy theories lead.
Advice is to manually save if your just building for 200%, then check blue circle before logging out.