i tried this and it got suspended. i believe it was from an asic search as I was very careful. it lasted for about 6 months till they suspended it but you have to pay $500 to get a company account etc.
If it's public access AND it's free, you can bet some low level employee at eb ay reported it to his superiors for usage ...and for heightening his image.
Could have been a disgruntled customer, or even a competitor.
I think some sellers over do it with the attitude of "trusted seller as I'm a business with an ABN number".
I had been watching sellers of a particular VERO item come and go, when I noticed the new approach of the "business" seller with an ABN number.
So I ran a check and it wasn't real.
I only watched these as I thought about doing it myself.
Seemed like too much of a hassle for me, plus it draws too much attention.