I'm curious about actual sales numbers, although I understand that you might not be willing to share that.
To date, my biggest day was 22 units, although it's dropped off since then. The rankings seem to lag a bit behind sales, perhaps by as much as a day. If it settles down at a steady 8-10 units a day, I'd be totally happy, but it remains to be seen if Amazon will promote my book enough to maintain that. I do know having multiple books helps to boost sales - so I'd better get cracking on my next book...lol.
Although these numbers may seem low, the e-book market is growing by leaps and bounds, and considering the cost of getting self-published on KDP is zero, I really can't complain. Heck, I didn't even pay to have my cover done, I did it myself.