look at it this way .. if paying for a real shop in the real world compeared it to ebay 

FVF =  (Shop Rent which could be $2,500 - $5000 per month)

Paypal fees = Bank fees ( $300 - $500 per month) includes bank & eftpos fees 

Postage is just postage & should be covered in item cost or as seperate amount 

continginies .. all the big retailers add 30c-50c per item to cover shop lifting ..(cyber/ebay shop lifing is real)

NO advertising costs .. ebay does it for us  

look at ebay as one big super shopping centre .. & we are sub leasing some floor space .. just as Harvey Norman does at his stores

having ran a real shop .. I am now more comfortable doing it all on ebay