ced08738_Cloud_Pros_and_Cons___Adobe_CC__Adobe_Creative_Cloud_pros
If I wanted to buy the Master Collection it would cost $2600 according to Amazon. Then it's $1766 for an upgrade. The $50 a month would be cheaper in the long run. Especially since Adobe changed the upgrade policy. [Adobe Creative Cloud pros] 
No need to worry about upgrades. Adobe Creative Cloud members will get new versions of software as soon as they are released. At the same time because of the new Adobe upgrade policy owners of licensed products will have to upgrade at least every two years without possibility to save by skipping a release.
Adobe Creative Cloud Pros and Cons | Adobe CC
Adobe Creative Cloud pros