What they say is because joymax only cares about money...
And believe it or not but if they kick all botters they'll leave and they won't get much money anymore + chargeback will cost them money xD
But since there are lots of goldbotters who can easily reach level 80 or something without being banned i don't know it this is fully true (Goldbotters won't buy silks EVER, maybe the owner will do, but if he pays them 10$ and takes about 100 slots in server i should ban him anyway
)
I guess joymax has not the time and the technology to detect them all and to kick them from the game.
* BTW: if u bot without buying silk u won't get banned anyway (in most of the cases), maybe joymax things u'll spend more money if u are faster level 100??