Adobe has chosen the wrong subscription model honestly. There is nothing wrong with subscription models in certain cases but it needs to be catered to the right audience. Instead of selling subscriptions they should sell support along with free upgrades for their corporate customers as 20*12 = 240 a year. This is cheap for a corporate customer. If they were smart they would also split photoshop into photoshop commercial, and photoshop personal, with the condition the later being sold at say $250 or so and the former sold at their current prices (the stipulation being personal can't be used for commercial work)
This is exactly Wolfram's scheme for Mathematica. Mathematica 9 base license is about $2000. Their corporate support plan with free upgrades is about $350 a year (which is fine for corporations using their software) . They have additionally doled out a personal version literally for hobbyists which is $249, which is perfectly reasonable for what mathematica does.
50 @ 1.4
35 @ 1.4
200 @ 2.8 mm