Ever since the milliondollarhomepage, there have been so many of these types of sites launched - the only problem I can see is that the original won due to the attention it got in the media, and all the subsequent efforts have attracted little or no interest in comparison.
It's a bit like that fella that sold his forehead on ebay, and managed to get something like $22,000 for a one-month temporary tattoo. He managed to get interviewed on TV, taking the logo with him, thereby making it worthwhile for the company that won the auction. In the following weeks, there were hundreds of copycats, some were even offering permanent tattoos - only problem was that it had already been done, and no-one was interested.
I think that Pixel advertising has had it's day. It was a gimmick, and to sell it as a serious alternative to reputable web directories and more traditional marketing techniques seems absurd to me.
But I might be wrong.