Same price to upgrade from C5 or C4?

It galls me to see, if I understand rightly, that it will cost the same to upgrade from C4 as C5.
I have hardly had a chance to use C5 since I paid £185 to upgrade from C4. Surely there should be some discount for this previous payment.

If you bought your Cubase 5 after December 1st, then you should be able to get a free upgrade.