Someone just PMed me asking if I would sell him a toy but post it to him for free.

Why would anyone do this? Do they think that Australia Post is going to generously let me send stuff for free? I only ever ask for a discount if I'm either:
a/ purchasing multiple items, or...
b/ I can do immediate payment and pickup
I never ask for a discount without offering something back. Isn't that how negotiating works?

Simply asking for a discount or free shipping without any form of counter-offer just feels demanding and entitled.
"Give me free shipping."
"Give me a discount."
Really? Why?!

I once asked a buyer why, and he said that it was too expensive; note that this was over a really cheap price too (you all know my "Not above RRP" price guarantee).
Anyway, I've told this person that he can have free shipping if he buys 3 or more items from me.