I request English from you after every post you make, yet to happen.
$60 is for a large amount of storage space.
"In Unix-style computer operating systems, root is the conventional name of the user who has all rights or permissions (to all files and programs) in all modes (single- or multi-user)." Also known as Super-User or SU
When android was first released it came with root access, then the first update closed it up for security reasons. So to regain root access, you basically switch back to the original android, and then install the newer ROMs(android, hero, etc) which have to modified to keep root access.
It will allow you to run different roms, unlocks multitouch (pinch zoom), allows for tethering (your laptop will connect to your phone wirelessly and you can connect to the internet through your phone), over-clocking (make computer run faster), saving apps on the SD card, basically you can do whatever the hell you feel like to your phone.