Adobe seem to be doing a bit of testing to see whether they can raise the price of subscriptions of different periods (1 month, 50 days, 1 year) without pushing people back to CS6 (in the case of the photography plan), was my interpretation of the questions asked. They were also testing what sort of discount we'd need to be persuaded to pay up front rather than as you go (without letting you keep the software at the end of the subscription period, of course).