I'm with you Steve. It's a big part of our income, and pays for our vacations and extras. I still love eBay, and my profit margin, even on small things is still enough that I'm happy with my net income. I think you and I treat as a business, and you know there are a lot of deductions that go along with a business.
Since you mentioned the sales tax, it's important to know that if you are selling on eBay to different states, it's best just pay it, and when you fill out your Schedule A, put that down as a deduction (under taxes paid). It's too much work, not paying it, doing the paper work and keeping track of what state I sold it to, and then paying the sales tax in the end, if I don't sell it in NY. In reality, you are only suppose to NOT pay sales tax, if you are selling within your state, and with eBay I could be selling it anywhere (the whole idea, as you prob know, is that your state wants to buy the item, and sell it for more, and give them more salestax. Salestax for me, is never an expense, since I charge sales tax on eBay and forward it on. In NYS, it's a large fine, if you don't pay the sales tax, and then don't sell the item within the state...unless you then pay it on your schedule A.
One great change Steve, that you may not know about, is you get a percent back from eBay if you are a power seller (and now you can become one with quantity of sales, not just amount) and have good DSR's. I've been getting between 15% and 20% off of my eBay bill each month. That is a real bonus that I love.
To the OP..the best thing to do, as you just start, is to check out your local mission stores. I get my best items there to resell..sometimes new in the box. It may take you awhile to figure out what sells good, and it does take time, but I do a lot of completed searching for items I have seen. I have also brought along my computer to garage sales and log on (we have a lot of free wifi in our area..outside libraries, police stations, many coffee shops) and look up items to see how they are doing on eBay. If they are doing good, I'll go back to the garage sale and bargain for the item.
You really can't include sales tax among your ebay expenses. If you are selling an item that you originally bought for personal use and are now reselling, sales tax shouldn't count as an ebay fee. If you are doing business on ebay and buying items specifically for resale, you should have a business license and be exempt from paying sales tax. I've been selling on ebay for 11 years and got my business license ages ago. When I purchase items for resale, I just tell the merchant and they give me a form to sign with my tax ID.
If you are buying for resale and paying sales tax, you aren't doing it properly.
Has ebay changed? As someone who has been actively selling since 1997, I would certainly agree that it has. Can you still make money? Absolutely. Ebay is bigger and more popular than ever, especially now with the economy struggling, people are turning to ebay and craigslist to find bargains. I hadn't sold for a while and just started listing again 2 weeks ago. Between ebay and half.com, I've already taken in over $217. Quite a few of the items I've sold were things I either got for free or personal items that we no longer wanted, so my cost basis was zero. The items that I bought for resale have all sold at a profit.
Is it a lot of work? If you don't do it regularly, it can be. If you can set up one space in your house for ebay tasks, however, and keep everything you need together, it makes it much quicker and easier.