I only have paysites so this may not help you. But I did release 'mobile designs' and saw: a drop in sales. So then I tried 'responsive designs' and saw: a drop in sales.
Check out one of my 'non-responsive/non-mobile' designs on your smart phone:
Fellucia Blow - Welcome - Erotic Blowjob Videos
Welcome to Wicked Sexy Melanie - Free Preview
Go past the Splash page. What I found is this design - based on tables and the same as my desktop version - does GREAT with mobile users! The tables/thumbs auto-resize depending on the device, the video plays, and the thumbs can be expanded (zoom in) which causes better 'user inter-action' other than scroll scroll scroll exit.
So that's my experience. I do not do responsive or mobile designs. LOL Best of luck!!
