It’s not the space the actual cel takes up or 
the cost of storage.

It’s the dollar value put into the cel money 
that could be used on something else to generate 
a profit.  They may be taking a loss on that 
particular cel sale but then they may be making 
a profit on the dollar value by getting 
something else that they can sell.

Cels are very expensive to hold, because if they 
don’t sell right away you have to consider the 
possibility of a loss and that there is a good 
chunk of money that you cannot be using to make 
a profit.

Also, if you buy 6 cels for $100 each
Sell 5 of them for $120 [20% mark up]
You have covered your costs [ignoring 
other “normal” business operations expenses]
So that means that whatever price you sell cel 
#6 for is profit weather it be $120, $100, or 
even the $60 of a 50% off sale.

The joys of going to a business school


Also, most "new" cels are sold immediately after 
an update.  So they are not actually selling 
like half their cels, they are selling like half 
of there cels that did NOT initially sell.  That 
is a big difference.