
This post contains affiliate links.
I've been selling items on eBay since 1998. My current account was created in 2003 and merged into my first one, but I still have over 21 years of experience selling.
What are my best tips and secrets for pricing an item?

It is at this step I decide if I can make enough to make listing worth my time. eBay fees are not exactly cheap, but they do allow for a world wide audience. If I can't make about $10 profit, I won't list an item.
I generally price my items a bit above what the highest has sold for on eBay. I have these things going for my sales:
- I am an experienced seller (20+ years of experience)
- Great feedback
- I ship worldwide (many people don't)
- I am willing to wait for the right buyer.
- I give 10% of all my sales to charity. This helps sales. You can read why here.
For items I can't find the exact item, I will search comparable listings. Say I have a collectible for Florida State University, but I can find something similar for Vanderbilt. Because Florida State has a bigger fan base due to Football, I would charge more than the item for Vanderbilt. Items for schools that have die hard fans often will sell better than a school with no football team, such as New York University.
I found what I could tell was a vintage drinking glass for the Nebraska Cornhuskers one time. I couldn't find anything like it online. So I decided to list it on auction, and listed it at the lowest I was willing to take. From my research I figured I could get at least $30 for it. Some of the people who collect Nebraska items want everything, and after searching eBay, Pinterest, and Google, I couldn't find any drinking glasses just like this. So I listed it with good photos. Seven days later, it sold for over $50. The buyer sent me several photos of his Cornhusker room with hundreds if not thousands of items licensed by the University of Nebraska. I could have easily thought, "It's just an old drinking glass" and put a $9.99 buy it now on it. But I decided to research and it paid off -- it sold for about 53 times what I paid for it.
I also consider cross collectors when I find something that I don't know how to price. There are people who collect cat items. There are people who collect figurines made by a certain company. If I had an item that would appeal to two or more different types of collectors, I would charge quite a bit more if I could find nothing to base my pricing on -- I figure
I'll admit, sometimes I do make mistakes and wish I had sold things for more than what I listed them for. But it's much rarer these days after I do research. I started using fixed priced listings in 2014. I had bought a Christmas Cross Stitch Stocking Kit for $1 and it sold for $28. I was happy until I saw some of the prices Christmas Cross Stitch Stocking Kits can bring. Had I waited I could have sold my kit for over $60. (If you follow the link, you will see I didn't have nearly the expensive lesson as I could have.)
I started pricing my items high after that. My mother loved to watch my listings and she told me I was listing things for more than they were worth and I was expecting too much from them. Well, I have sold consistently since then -- and I will run sales from time to time to get stuff that has sat around for a while to move.
As Jay and Rayne say at Scavenger Life, I "list it and forget it". Yes, I'll run sales, I'll see what best offers come in, etc. But sometimes I list as high as I possibly think someone will pay for an item. I had an item sell last year for $60 that I had originally listed at $325. It was a glass item marketed to kids in the 1980s and I had hoped to get more for it because I expected collectors would really want it. But after a year on eBay I took a decent best offer, the item is now out of my storage and I don't have to worry about breaking it. I paid 25 cents for it, so I still made a great profit, just not as much as I had hoped, but I'm still happy about it.

Finally, I want to share with you my favorite tape dispenser. This has a place for regular transparent tape, packing tape, as well as a pencil holder where I store my Sharpies for shipping. Other than my scale, I consider this tape dispenser to be the single best item I ever bought to invest in my eBay business.