the past two months, last day of the month I got no sales. Then morning rolls around and I have a bunch (way more than avg). Basically by delaying reporting by one day, they get to hold the revenue for an extra month. picking up extra interest, investments or whatever they do with it.
For one person it isn't a huge sum, but on a collective level, if they do it to tens of thousands of authors, they just made a huge chunk of change and no one is the wiser. it could be an innocent delay but it is something to keep an eye out for when the last day and first day rolls around.
This hapens to me too. However I would not read anything sinister in this.
It can take up to 5 hours or more to finalize book sales depending on whether the purchaser uses a debit or credit card and the speed of processing. On top of that, there are the usual glitches that come from time to time.
I don't think Amazon is involved directly or indirectly in unfair trading practices.