"Dublin hoteliers may already have killed the goose that laid the golden eggs, with attendees last year complaining that hotels had cynically raising prices by up to 500 per cent for the days of the summit."
So that will be bog-standard economics in action, then? Increase demand for a constant supply, and the price will go up. Anyone familiar with other popular trade shows and conferences will have seen the same effect everywhere (except places like New York, where the almost-constant supply of such shows means that prices are high all the time!).