I think someone missed the point.
Did the auction have a buy it now option?
I doubt it, You can not just email the seller and ask them to stop the auction now and sell it to you.
Buy it now is an option they enable, and if you want to buy it now.. .You simply click the buy it now button, pay the predetermined amount for buy it now, boom.
Its not something you email the seller, If the seller has it its on the auction page.
emailing a seller and asking to stop the auction so you can buy it now, is not something ebay condones. And is outside the realm of protection ebay offers.
30gal; Bala Shark, Pl*co