I'd normally deleted such a retarded question but I'll answer it to highlight the stupidity of some of the questions we are getting.

* Yes, yes I do know a lot about buying tickets on the day.
* It will obviously be worth it if you get the tickets

Now, here's the major part. "... the chances of getting them ..." Erm, how should we know? If you camp now right next to the box office then you should get them. If you arrive at Xmas, you won't get them. Obviously if you read previous FAQs and actually visited this page: http://www.strictlyreading.co.uk/story/reading-festival-advice/strictly-... you would not have wasted your time asking a question that has already been answered.