Ellen, if you take those 130 items you have listed for 99 cents - $2 shipped and throw them all in the trash then your store will instantly become more profitable.
You lose money on every sale. I don't care if you are buying stamps under face value and shipping them that way, you are still losing money on the category overall, hurting your metrics by not having tracking and you will get claims from some buyers who know that they can get their money back as soon as the see that envelope show up with a stamp on it. That refund hurts quite a bit when you were already losing money on every sale.
Even the stuff that technically has a tiny profit (the stuff between about $1.15 and $2 shipped) is still not making any money as it is impossible to list and ship those items fast enough to make any money.
When I worked at the card store we timed the processes and the cheapest price we could sell singles at online and still make enough to pay the $10 an hour to the employee doing it was $2+ shipping. I have heard they have since upped that minimum to $3.
My card store which I no longer source for has a minimum price of $2 worth shipping and when I stopped listing cards entirely and instead focused completely on my non-card store my ebay sales essentially permanently doubled within a month.
If you somehow magically had a day where all 130 of those items sold to separate people and you spent 6-8 solid hours shipping to simply lose about $10 at the end of the day then you might understand where I am coming from a little better.
