Stamps also provides a discount you don’t get at retail for certain shipping methods so it can definitely make it worth it.
For instance, First Class package for less than 3 oz. is $3 retail. Via Stamps, Etsy, etc. it’s $2.61.
Now, you say $0.39 isn’t enough to pay $15 a month. But if you do more than 39 shipments a month, you start saving money.
I was averaging about 400 packages a month last year and at the time, by paying the Stamps monthly fee, I calculated my savings to be $60 a month by paying out the $15/month fee…it was worth it.
This. Always make sure you weigh it with everything but the label. Also, be careful with online selling, some sites like Etsy are great in that they allow you to put in a calculated shipping value based on where the buyer is, other sites don’t and you just set a shipping amount. On those sites (Amazon), your shipping value is entirely set by you and if you misjudge it, you’ll eat shipping costs. I almost lost about $8 recently but was able to ship via FedEx or UPS and got the cost down. I’ve also gained some difference between the actual cost and the charged cost. On certain sites, that is acceptable.