You're obviously quite clearly confused. Allow me to explain for you. The dictionary definition of inconvenience is; "the state or fact of being troublesome or difficult with regard to one's personal requirements or comfort.".

There is nothing troublesome or difficult about offering a superior service for a lower price.  In fact, using Australia Post is far more inconvenient for me, as it requires driving to another suburb to lodge the item, and it can only be done during business hours - as opposed to simply placing the item on a stool on my patio at any time of day or night. Therefore, the word "inconvenienced" does not apply to anything I had previously posted.

I should also explain to you, since you obviously don't understand how the checkout system works, that the buyers select whatever shipping method they desire. It is them using a shipping service, not me - my role is simply to deliver the goods to the buyer's chosen carrier. If any part of that shipping process causes them any inconvenience at all, it's as a direct result of their own personal choice.

To address your concerns, not that how I conduct my transactions is actually any of your business, I most certainly do pass on the savings to my buyers. 

Hopefully the above explanations assist you in better understanding how online sales operate.

Now, if there's anything else you require assistance with, please don't hesitate to ask.

Enjoy what's left of the weekend 😊