What does this mean..........

Stratum #1    Vardiff 8 - 2042    stratum+tcp://stratum.syscoin.me:3000
Stratum #2    DIFFICULTY 8    stratum+tcp://stratum.syscoin.me:3008
Stratum #3    DIFFICULTY 64    stratum+tcp://stratum.syscoin.me:3064
Stratum #4    DIFFICULTY 128    stratum+tcp://stratum.syscoin.me:3128
Stratum #5    DIFFICULTY 256    stratum+tcp://stratum.syscoin.me:3256
Stratum #6    DIFFICULTY 512    stratum+tcp://stratum.syscoin.me:3512
Stratum #7    DIFFICULTY 768    stratum+tcp://stratum.syscoin.me:3768
Stratum #8    DIFFICULTY 1024    stratum+tcp://stratum.syscoin.me:4024
Stratum #9    DIFFICULTY 1536    stratum+tcp://stratum.syscoin.me:4536
Stratum #10    DIFFICULTY 2048    stratum+tcp://stratum.syscoin.me:5048


Why the different difficulties?  Why would anyone choose the higher difficulty ports?