Interesting question. Placing any bid on a buy it now auction does make the buy it now option disappear, as long as there is no reserve or the bid placed exceeds the reserve price. So, its possible that the OP placed the $1125 bid but the Buy It Now option was still available because the reserve may not have been met. However, placing the $1811 bid would have made the BIN disappear. The minimum bid showing on the listing would have been one increment over whatever the reserve was. Other bidders then must have placed their bids. The last bid placed was apparently for $1810, but since the OP had bid $1811 previously, he won.
It is not a bad strategy on the part of the OP if he was willing to pay $1811 but hoped to pay less.
It is not a bad strategy on the part of the OP if he was willing to pay $1811 but hoped to pay less.