Maybe he/she or the band? (because to be honest i never heard if it before) is not popular in europe.(and as said i´m from europe and don´t know kaskade)

So why would you hop on a plane if you know that you will have to play in front of maybe 20 people? ;)

Because nobody knows you nor are they interested.

So in general the "european tour" would cost more money that he/they

would earn.