As long as an idea can make things more efficient or provide a useful service people are willing to pay for, it's a viable idea. This is an illogical argument:

As long as an idea can make things more efficient or provide a useful service people are willing to pay for, it's a viable idea. This is an illogical argument: "NO BOOK EXCHANGE HAS EVER REALLY SUCCEEDED. I HATE TO CRUSH DREAMS BUT PLEASE FORGET ABOUT THIS."