Yep, I am not fan of Idles, they do nothing for me. But I can guarantee that they will pull a massive crowd, and fair play to all those who do go and see them and have a great time.
I'm not sure I agree with the "£240 for a good lineup" statement. A "good lineup" is subjective. For many people, Idles being on the bill does constitute a "good lineup". Who are we to say that their inclusion makes it bad?