This chart of the Top 5 Roleplaying Games (hobby channel) reflects sales in Summer 2014.  The charts are based on interviews with retailers, distributors, and manufacturers.
 

Top 5 Roleplaying Games – Summer 2014
	Title	Publisher
1	Pathfinder	Paizo Publishing
2	Dungeons & Dragons	Wizards of the Coast
3	Star Wars	Fantasy Flight Games
4	Shadowrun	Catalyst Game Labs
5	Dark Heresy/Rogue Trader/Deathwatch	Fantasy Flight Games

 
These bestseller lists are from ICv2's Internal Correspondence #86.  For more information on the game market in Summer 2014, see "Another Strong Season for Game Sales."
 
For the bestselling Collectible Games in the hobby channel, mass channel, and over-all, click here.
For the bestselling Card/Dice Games in the hobby channel, click here.
For the bestselling Board Games in the hobby channel, click here.
For the bestselling hobby channel non-collectible Miniature lines, click here.

For info on how to get your copy of the ICv2's Internal Correspondence #86, with the full market reports and size estimates, bestseller lists, and reviews, see "ICv2 Releases 'Internal Correspondence' #86."