The answer from me is a resounding no, you were absolutely NOT too harsh.
From what K1ooo said, it sounds as if you dodged a bullet, but even supposing this was a genuine seller, there is no excuse for this behaviour.
Any seller with any brains would read the selling guidelines and the fee structure before they listed.
Sure, some new sellers get caught out and start auctions too low, but in that case I would expect them to just write and say 'I am so sorry, I made a big mistake listing at that price and have to cancel the auction.'
What I wouldn't expect is a demand for several hundred more dollars, privately, off ebay basically. Seriously, that is against ebay policy and no good for buyer protection either. I wouldn't touch it, even if he had 'lowered' the price even more.
As for the 3 years warranty, where was that supposed to be coming from?
This seller doesn't look to be running a steady business, he doesn't look to be some authorised seller, he can say whatever he wants, but it doesn't mean any warranty exists. If it did, why would it not have been mentioned in the original ad.
The guy is lying to you. He is also blatantly breaking ebay rules, he deserves every bit of your feedback.
If he is a scammer, it is a warning to others.
If he is geunuine, it's a wake up call to tell him to get his act together.
My advice to you though would be to have a look at these PCs in stores, there are Black Friday sales coming up. You may not nab one for $650 but then again, you'd be getting a genuine one with a genuine warranty.
