No troops in defence

What’s the benefits of removing your defence troops.I have come across some of these lately 


It’s probably from people playing around with different bases for the contest. 

Okay I thought maybe they get some benefits for their next opponent 

I have my islands defended as strongly as I can and all my opponents are much stronger than me so I thought maybe doing this you get lesser opponents 

Eventually that will happen if you lose a bunch of trophies.