Well just added 20 domains after reading this.
Took about what... 20 minutes?
Anyways now I'm a bit shocked that 1., domain name as keyword matched 100% the preselected niches 2., each and every tube site looks unique and well designed even though I have not clicked a button to tweak it...
Simply, even if it does not make me any money (which is likely lol :D ) :
RESPECT