To fishhawk the OP,
Im not clear or sure you are understanding the problem correctly so lets sort this out.
Being subject to income tax and income tax isnt the same thing. FYI, ebay and others have been reporting to the IRS for quite some time now. If you are saying you want to sell, and sell at a profit, with no tax liability and no reporting to the IRS, that hasnt been possible since at least 1913. Sales income to a self-employed person is taxable from the first dollar and thats it and nothing here is new.
But ALL income/sales being taxable doesnt mean you will necessarily ever pay a dime in tax. $100 in sales - 100 in expenses = 0 profit and therefore 0 tax. That $100 was taxable, yet no tax was owed. So whats the problem? But, $100 in sales - 0 expenses = $100 profit which is subject to 15% tax which includes Social Security. So you paid $15. Is that so bad? If you want to avoid all work and had $7,000 in sales, just say $7,000 on your tax return and pay $1,050 income tax and its done. WORK on this and maybe pay NOTHING. Up to you.
Lets continue. A lot of people want to sell stuff tax free, no bookkeeping, no tax returns, no nothing and thats called tax fraud and that can mean prison. Its the law, you HAVE to report it so what difference if you do or Ebay does? Its not fair to come here and whine about lack of ability to be a fraud. Until the IRS is abolished, we have to comply. So what are the best ways? THATS the question.
Example. We make rifle slings and sell on Ebay and also Ecrater.com which has no reporting system (doesnt mean you dont owe tax, its that they are based out of US and dont comply with US laws. I highly recommend Ecrater.com because they dont seem to care what people sell and charge much less than Ebay and others. I think we pay 2.5% at our desired level of service). We keep strict books and account for every cent. We accurately report all online sales and pack in every possible and allowable expense. We have much experience at taxation and self-employment issues and know what we can and cant do. Our taxes are minimal, if any. We dont cheat or lie and we dont have to.
Given that i will assume you will want to do the same and be honest, its a matter how to go about your work with the goal of lowest possible taxes which is a very legit mission but requires work on your part. In the new Ebay Managed Payments, google that in youtube and follow everything thats being said about it. As one channel says, its time for people to start keeping books and there are explanations about how to do it.
OUR problem with Managed Payments isnt the SS#, its that they want total control over your personal bank account for credits and debits whenever they like. We got a notice that they would cancel the account if we didnt sign up by February. I got nervous and began to sign up, getting half way through and then stopping. I stopped to read the fine print in the agreement which to me is devastating for the control they want. No way. So I called them last week and went over the complaints and said I dont want this, i dont agree. They said too late, you already signed up. Really? I never entered any bank info. I hung up and called again, getting an agent who said, "well, its just an invitation, not a requirement." Really? So Ebay lied to get people signed up? Sounds nefarious. So I said, you cant have my personal bank account, I will have to get a new account somewhere, some bank and let you know later. We are going back and forth in emails now. Im thinking that its time to stop selling on Ebay simply because of the control they want over your bank account. Nevermind any reporting of sales they do because you are going to report the same number on your tax return but with expenses and "cost of goods sold" to drive that potential tax as low as possible, possibly to zero.
That said, sales of personal household items are not a taxable event, in general. SOME places in the country, cities say that garage sales are taxable but i have yet to find anyone who ever paid income tax on the sale of their 30-year old lawn mower. But on this question, please do call Ebay and ask if they intend to report to IRS such a transaction on your account. If so, then they will report $10,000 total money through your account, and you will report $3,000 in merchandise sales with a letter explaining that the other $7,000 that Ebay reported was for "cleaning out the attic" by you. In theory anyway, Ebay is interested in reporting of regular merchandise in the normal course of business, not an old broken clock you found in your closet. Call them for clarification.
Also, for now, start checking out other competitors like Ecrater, Bonanza, Esty, there are many, and you can also explore setting up at Proxibid.com for auctions.
The upshot here is to plan to be honest, create a system and not give up so easily.