You could say about anything "show me one place where x has value". In such a position, you'd always be able to dispute any point raised.
If you really believe that there is nothing of value in the Tractatus, then you should give a short summary of what you think it is about and why you don't think it has any value.
With such a summary, it's possible to have a debate, since your assertions can be challenged.
I think the problem is that wynand didn't make the original reply to you, he just inserted himself into the debate without saying anything substantial.