Here is an example. Say a fuel company went complety mad and intoduced "$10 a month for unlimited petrol". You think hey, this seems abit odd so you ring up and they reassure you that this wonderful deal is here to stay. Great you think. All of a sudded EVERYONE is driving their cars EVERYWHERE all the time. Say this goes on for 11 months, and you get quite used to it. Would you be a tad upset if you pulled up to your local fuel station and read a sign saying "New Deal:$10 for the first 5 Litres of petrol each month, thereafter 20c per 10mls"? Now lets assume that every other petrol station is now charging 20c per 10mls, no $10 for the first 5L. What would you do? Here is what you would do. First of all you would be outraged at the fuel prices. Second of all you would buy 5L of petrol per month from that petrol station cos hey, its still the best deal in town right? But you would be mighty pissed off. Dont read too much into this, petrol isn't the best example but hey, what are ya gonna do?