* Because i can.
* Because i can understand the technology behind the "magic".
* Because i can understand the technology behind the "magic" and design my system better.
* Because i can understand the technology behind the "magic" and design my system better and if PaaS provider goes out of business i have a chance to survive.
* Like snap said before : i've got the power...
And most important : because i'm a masochist bastard, who has trust problems...