Its all dependent upon how you use it or allow it to use you my brothers and sisters.
I could rant on about the pros and cons as they are many yet I will simply note a few personal experiences.
From my initial attempts at sales I found it priceless.
I would buy something from a seller who sold similar items that I was selling and bam foot in the door and you would not believe just how successful that method was.
In no time I wasnt selling retail - they were selling my stuff retail and I was moving large amounts at wholesale which is less work/stress and more pay.
In maybe 6 months it was running itself quite rapidly.
I continued to scout, find little niches and otherwise compound upon my contact list.
To this day I dont even have an ebay account but my stuff is still being sold on ebay around the world.
Dont ask please as everything is confidential on a need to know basis
Some people like the mr lister easy stuff so they buy similar/same items to resell in bulk or they drop ship etcetc yet I found that several times a month certain collections of various "things" would go off well below value so I started buying these "things" and busting up the sets or offering them in more appropriate categories etc etc and I turned 100-200% profits usually.
Yes its a bit of madness to do custom auctions and to deal with the people yet once you know the ropes its nothing but repetition and time.
Dont even get me started on all the money I have saved on "gently worn like new" childrens clothes and things of that nature.
I would say my entire wardrobe of casual wear was bought on ebay at 25% the price of something similar retail.
In case anyone is wondering I dumped it all in 2005 and went back to work in my previous career.
I look at it like the lottery and this time I won!
PO does strange things to people, strange things indeed.
Is ebay just another part of the unsustainable madness that is our current reality? Yes, yes it is and so inevitably it will die.
Its the big yard sale in the sky yet it is just a temporary illusion.
It is easier to enslave a people that wish to remain free then it is to free a people who wish to remain enslaved.