I never understood that mentality - by which I mean, if someone else is selling an item for eg $5, anyone selling it for any more than that is ripping off their buyers. I mean, I get that some buyers don't look (or think) beyond anything other than what they'll pay, but I find it hard to believe that someone doesn't even have the slightest grasp on what causes pricing differences (other than seller greed). I hear about it all the time in collectible categories (eg someone spots a piece in poor condition for $100, and tries to negotiate the same price from someone who has a mint condition version at $200 or so).
Also, I used to run auctions on (moderately) popular collector items when I first started - I would get messages asking for discounts, special prices on bulk lots etc, from people that I very quickly suspected contained intentional spelling and grammar errors. I found from a small bit of digging (much easier back in those days) that these people were often dealers / sellers themselves, and I suspect they wanted to make themselves look dumb less intenlligent that they really were, as if it would somehow make me more vulnerable to their otherwise non-existant negotiating skills. 
Had to laugh at your reply.
I think it's fair enough to give a feisty answer if someone is rude like that.
Basically, the man had no reason to message you. If he wanted the item cheaper & could get it cheaper elsewhere, he just needs to go ahead & do it.
Your name's not Bunnings.
