My main computer at work here is tied up for 30 minutes doing some number crunching, so I decided to do a little statistical research myself.
I looked at completed ebay listings for platinum and/or palladium prints over the latest three week period. Here are the results:
Total offered: 76 prints
# of vintage and/or secondary market prints 7
Total vintage prints sold: 5
% sold of vintage prints offered: ~70%
Highest price for vintage print: $1100
Lowest price for vintage print: $20.99
Total 'new' prints offered: 69
Total 'new' prints sold: 12
% sold of new prints offered: ~17%
Highest new print price: $96
Lowest new print price: $29.99
Average new print price: $63.62
Landscapes sold: 5
Nudes sold: 3
Still life florals sold: 4
Annualized 'new' print sales (assuming that this three week period is somewhat representative) $13,250 for 208 prints
Assuming the average sales rate is about 17% (change to 16-2/3% for some easy math), that means that one out of every 6 listings sells. So each sale has to carry the ebay fees for 5 unsold prints. Again, assuming you list a starting price of 10.00, that means each successful sale will have 6 x $0.60 in listing fees for a total of $3.60, plus the completed sales fee of 5.25% on the average 'sold' print price of 63.63, or and additional $3.34. IOW, on average ebay will get $6.94 of your sale. So your gross income (after ebay fees) per print sold will be $56.69.
Now for a gross simplification: assume you don't relist unsold prints but every print listed is a new one. That means that each sold print has 5 unsold siblings in your print drawers. So the breakeven point on a print would mean that to make ONE CENT, you would need to have your per print material and time content no more than $56.68/6 or $9.44.
I'm glad I have fun doing this.