Does responsive web design make you more money?

Yes. Yes it does. Some great stats in here including this gem:

O’Neill Clothing saw perhaps the most impressive increases after their conversion to mobile-ready. Transactions went up 112.50% on iPhones and 333.33% on Android. Conversions rang in at 65.71% on the iPhone and 407.32% on Android. Total revenue cleared 101.25% on iPhone and 591.42% on Android.

Wow.