I was going to say the same as tippy - it's likely people saw both, and wondered why you valued yours less than half the price of the other seller. People will actually believe the value placed on something, and that price differences mean condition or quality differences, even in a private market.

It might sound strange, but if they read both descriptions and saw no flaws disclosed or pictured, that might actually increase the doubt, as they'll start to wonder if there is undisclosed problems, i.e. there must be a reason why yours is only worth $45, and conversely there must be a reason why the other one is worth $100

Sometimes it's just timing, too - i.e. the first one sells to someone who believes the value, really wants the item etc, while everyone else is interested but not as much. The first time I ever listed items on eBay, I listed something that I had bought really cheap, never ever used, but saw a bidding war on the previous week and get a really good price. Back in those days, 99c auctions were all the rage, and I confidently listed my gear, all starting at 99c, and waited for the war(s) to begin, and the prices to skyrocket... 

Well, mine got 1 bid, and I underestimated postage so I lost pretty hard on that one.  I'm guessing the person who lost the bid on the last one probably spotted mine and thanked their lucky stars their one and only competing bidder already got theirs.