What I do is put on a business hat and think in terms of actual benefits. An, in my not-so-humble opinion, responsive design doesn't really mean greater revenue. Here "responsive design" means a site where elements squeeze, move, re-align, collapse, etc. as you grab the sizing handle on your browser window and shrink or expand the browser canvas.
Why do I think this way?
www.ebay.com
www.craigslist.com
www.nytimes.com
www.latimes.com
www.ticketmaster.com
etc.
Of course, there are plenty of examples for responsive design. Amazon uses a mild form of it and it works well.IF responsive design were critical to keeping or increasing interaction or revenue all major sites would be using it today. I think it might be safe to say that the vast majority of the top 500 sites use fixed designs.
This doesn't mean that you can't have one or two alternative CSS layouts for mobile viewing. That might be the smartest approach: one fixed design for desktop and one fixed design for small screens.
With this, if you have the traffic, you can A/B test and slowly optimize each fixed design to improve conversions. With responsive design you might have to optimize over a dozen layouts, which is a huge job.
Again, in the end, I think that considering the options from a business perspective can cut through the crud and cause one to focus on what really matters if you don't have a hobby site.