Price of Unlimited + Anytime - Have I got this right?

[#1]

I'm on a legacy product, so I had a look at what it would cost me to shift to Unlimited BB plus an Anytime package for Phonecalls.
Ignoring line rental, it would cost me £14.99 per month.
Yet a new customer would apparently get this same package for £7.50 per month.
Have I got that right? 
If so, would you care to explain why the difference is _so_ great?

[#2]

The price difference is to attract new customers.

[#3]

The price difference is to annoy old customers.

[#4]

Old customers prepared to re-contract can give the Customer Options Team a call and see what deals are available.

[#5]

Just did that & saved me a few bob.
jim:quote

[#6]

How about some people posting the deals they got here?
Or are they sworn to secrecy?

[#7]

Well i was paying £17.99 a month for 60GB allowance download,now i have signed up for a new 24 month contract & for the first 12 month i will pay £9.50 & that is for unlimited,then the second 12 months will be £16.99,very happy.