prices of owned license
 

when i read the short description of the ownde license i understand that i can use it forever for 10 years for example and i havent to renew it but when i see the list of prices i cant understand what that mean :
1 - 2 $180.00 3 - 5 $166.00 6 - 10 $153.00 11 - 24 $140.00 25 - 49 $128.00 50+ $119.00so can you explain please , thanks