to vamvas its simple [if you buy to sell on ebay or anywere else ,you must include your sales from here on your tax income any profit you make for the taxable year must be included in your return .its earnings,,,,,

now the $10.000 limit which has come down from $20.000 is the turnover from anyperson that ebay sends to the ato. as asked by the ato. now if yor turnover is less than $10.000 , and if you buy and sell its still taxable income ,your profit only. but ebay does not send that to the ato . even if you turnover over $10.000 and prove you are only selling your private seconhand goods ala car furniture clothing and so thats fine. after all that the ato can change the amount with ebay or anywere else to $1.000,   crown casino is also the same it used to be $10.000 ,,if you colected more than that amount  you must sign and show your license ,which then goes to the ato.

but thats another story