Thats absolutely correct. Take Harry Potter 6th edition for an instance. This guy with id 'statusfashions' has posted more than 129 listings of the same book, while the no. of actual sellers selling the book is only 5, and i'm one of them. I'm offering the least prize, and i recieved hell lot of orders; But, now I'm starving for orders as this guy is not allowing the buyers to have a look at our item. So, its not just causing inconvinience to buyers, but also to sellers. And eBay seems to be doing nothing about it. Maybe they are too busy collecting the revenue from the sales to look over these matters.
To sapna: Your link is a piece of crap. I reported hundreds of multiple listing issues but none of them were removed.