People need to sell their stuff on eBay. There's a lot of other people selling their stuff on eBay. So people need to stand out from other people selling other stuff on eBay. What's a person who's selling stuff supposed to do?
The answer of course, is that you produce a commercial for the stuff you want to sell. And attract lots of attention.
Soon, consumers will hire agencies to produce entire viral campaigns. And toasters and bicycle parts will be sold. The world will be a better place.