I am an IT Manager, and have been for over a decade. I personally supervise, or directly purchase computer hardware to the tune of ~$250,000 per year. Over the past four months, I purchased (2) 690's, (2) 490's and (4) 390's. We must have close to 100 360's, 370's and 380's. I have corporate B2B accounts with Dell, CDW and HP. Personally, I have (2) PowerMacs and (1) MacPro. I also have a MacBook Pro, a G4 Mini, an Intel Mini and a Black MacBook. Find that hard to believe? Go to the 'Show Your Set-up Thread'. Most of it is on display there. So, that blows your first point to dust.
The second point, "..comparing a PC with an FX4500 against a midrange consumer card, tricking out the Dell specs and being amazed at the cost difference... I'm not sure if you're taking the piss or whether you're hard of thinking. ", I stated I compared BOTH machines with the FX4500 installed. The X1900 was not an option for the Dell. So, to make it fair I used the FX for both machines.
I had considered cutting/pasting both quotes, but determined it was unneccessary. If someone was actually going to be considering each machine, they would discover this cost difference for themselves. What I did not expect was an ill-mannered, visceral, insulting response. I did not insult you, or even suggest your opinion was wrong. I simply contributed information for the OP. It is you, sir, who has turned a polite sharing of information into personal attacks. You should quit that.