Yup... I agree with the cause : " it doesn't really matter if you hear about a new conference within seconds, minutes, hours or even days", but not with the con

Yup... I agree with the cause : " it doesn't really matter if you hear about a new conference within seconds, minutes, hours or even days", but not with the consequence! PubSubHubbub is not about time, but about push (timeliness is a consequence). By having a push mechanism, you just allow for updates to propagate to any kind of application, rather than have them all poll the resources endlessly, wasting their resources, your ressources and eventually just making it not worth. You want other to consume your content. Make their life easier :)