I love ebay. Its great to use (if you know how to use it.) I have been on a roll lately, and thought that I should tell you guys a few convenient ways of doing so.

I always use a dropshipper. No, no, I don't mean some scam website that will waste your money on a worthless program.

I search for A popular item around the internet, I average the prices, and I sell my product for a tad bit above average. I made a script that makes it a little easier.

PHP Code:
<?php
//This eBay calculation script was created by noogah at cyclone999.wordpress.com

$averageOne = 1.25 ;
$averageTwo = 1.70 ;
$averageThree = 1.00 ;
$averageFour = 1.20 ;
$averageFive = 1.80 ;
$buyingFor = 1.20 ;
$ammount = 5;
$listingP = $averageOne + $averageTwo + $averageThree + $averageFour + $averageFive/5 + (rand(2.50, 4.50));
$profit = "$ammount * $buyingFor - $listingP * $buyingFor";
$ugh = "25 % $profit";
$pug = "15 % $profit";
$thug = "10 % $profit";
$totalP = "$profit - $ugh";
$donateC = "$profit - $pug";
$donateT = "$profit - $thug";

echo "Okay, I am working.
";
sleep(3);
echo "Almost got it..
";
sleep(3);
echo "I got it!
";
sleep(2);
echo "You need to list your item for $listingP
";
sleep(1);
echo "You're total profit will be $profit
";
sleep(1);
echo "You need to donate $donateC to charity, and $donateT to tithing.
";
sleep(2);
echo "Man, that was hard work. I am done now!
";
sleep(999999);
?>
Anyway, here is a hypothetical example.

The most succesful movie in the history of the world, Oogahranger, made it's stunning debut in June. Now, it's been released on DVD and blu-ray. the demand for this product is so high, that the company has had to double up on thier factories work.
You look on several websites to find prices on the offcial Oogahranger blu-ray. You find that the average price is $150.00.(LOL) You list yours on ebay for $167 buy-it-now, with a quantity of 15. They are all sold out three minutes later. You find the cheapest price from your list of averages, and you order from them. You have it shipped to the buyer, and billed to yourself. so lets say you end up paying $147.88 for the blu-ray you sold (including shipping) When all is said and done, you have $19.12 left over. But wait, with our quantity of 15, that adds up to $286.80!

Okay, so rare scenario. but it still works for me. Try spicing up your auctions with trailers from youtube, and whatever. Try it!