What does Rakuten KOBO mean? Rakuten's either Chinese or Japanese, like "bol.com" to the Netherlands. KOBO could be "keep one, buy one," but it used to be Books-A-Million or Barnes and Noble. See how confusing publishing can be?
I can't describe these next few sentences in terms of Amazon sales rank, so my approximate translation is the above number would be almost one copy sold per week (that's an Amazon sales rank of 100,000). So the above number is not 100k, so in Amazon language that would translate to a little less than one book per week.
But this is the sneaky part: I used to browse Rakuten, and one day I saw Chea Connoiters Louise at 550! It was just a fluke, but the number did not last more than a week (I think?) That number in Amazon language would be almost 175 copies a week. See why I'm excited? No? I'll keep writing (smile)