They usually do give a number.  like 28 items 
uploaded, making 2,946 for the month.  (these are 
arbitrary numbers, but you get the idea). 
I have actually noticed taro's prices vary 
widely.  I have bought a couple of beloved cels 
very cheaply from them, while at the same time 
gaped at the prices on AnC or Utena cels. I 
remember when they were first posting the Utena 
cels- they started out pretty average for the 
market, people bought them within minutes, then 
the prices went sky high. The inventory built, 
and now some of the cels are coming down again.  
As always, it's what the market will support.  I 
have had some cels of good quality of a character 
from a series cel for over a hundred dollars on 
ebay or my site, then six months later no one 
will buy a similar or even better cel of the 
character for fifty, while one that before would 
have sold for a hundred now cels for three 
hundred, and a month later two hundred.  It's 
insane.  I haven't been able to buy cels for a 
couple months now, and I'm pretty frightened to 
get back into it.  (plus I'd kinda like to kick 
this addiction.  ^_^)