I used to operate a decent side business as a seller on eBay, out of my office in an unrelated business. We had acces to a unique product that we sold variations of new in the box and did quite well. We warehoused inventory, packed, labeled and shipped from our office. It gave one of our office people something to do and was fun to watch the bidding craziness.
There were four different items, one was the dominant seller and we offered it as a single, two pack, and as a package with the other three. Our cost was always the same but the sale price varied wildly. We sold only on eBay, auctions with high starting price, low starting price, Buy It Now, one day, three day, seven day auctions, and tried every combination of strategies and ending days/times. We ran a spreadsheet to track the bids/sales/profits based on any factors we thought helped us maximize profit.
Ending on Sunday night was always best. Always.
Our best sale price would come from auctions that started at $1.00. There's a phenomenon when people start bidding on something-- it becomes "theirs" in their mind and no one is going to beat them out of it. They bid like crazy and we loved it.
How crazy you ask? Our item was unique and we had little competition so if you were looking for it, and found it, you would see that we had dozens of auctions for the exact same item running all the time. Auction item listed right beside a BIN for the same item, same seller, same description, same picture. BIN price, $119 but they would routinely bid the $1.00 item up to $150 and more.
We actually had an auction go to $250 once for an item that we also sold BIN for $119. Right next to each other.
That's right, more than double the BIN price. You might not believe that, I proobably wouldn't if I were you, but it's true and still makes me laugh.
We expanded the business to over 150 related items, mostly drop-shipped from our suppliers, but nothing ever sold like that one item. I eventually sold out my share of both businesses and moved on, and the guy who was left ran both companies into the ground like a freight train going off a high trestle. Both companies are long gone and the bum still owes me 12 grand...