Just a few years ago, the argument was being made that Paizo would never, ever, not in a hundred years, outsell WotC in the RPG arena. Now the argument is being made the WotC is going to be a solid competitor against Paizo in the realm of RPGs and its now WotC managing to be able to "get 50% of the Pathfinder sales." And the fact that DnD manages to eke out 50% of what Pathfinder sold is seen as a positive sign for WotC and the DnD brand.
I think it is more of a case of people thinking that D&D being identified as a "best seller" by 11% of retailers with only 11 new products on 2013 (most of which were actually reprints) is a positive sign for the brand. Similarly, I think it's fair to say that the fact that 26% of retailers identified Pathfinder as a "best seller" in 2013 is also a positive thing for the "Pathfinder" brand.
But using this information to
compare brands is dangerous!
For fun, I'm now going to make some seemingly reasonable assumptions to reach some extremely dubious conclusions.
Let's assume that it takes about the same amount of total spend on a brand for a retailer to consider that brand as a "best seller". In other words, Pathfinder sales in 2013 need to be >$20,000 (say) for a retailer to consider Pathfinder a "best seller". Let's also assume that the number of retailer responses listing a brand as a "best seller" is proportional to the total volume of sales.
We know from the report that 26% of retailers considered Pathfinder a "best seller", and 11% considered D&D a best seller. Using the above assumptions, we can infer from these percentages that income from Pathfinder products was 2.5 times more than the income from D&D products in 2013. (Since the ratios for 2012 and 2013 in the report weren't too dissimilar, let's also not worry about what proportion of sales was from back stock and what proportion was from new products.)
Let's say the total income from D&D retail sales for 2013 was $X. That means the total for Pathfinder was $2.5X. Now let's divide this by the number of new products released. For D&D, we have $X/11 per product. For Pathfinder, we have $2.5X/70, or $X/28. From this, we can conclude that the average D&D product in 2013 sold 28/11 or ±2.5 times more copies than the average Pathfinder product sold.
In other words:
D&D products outsold Pathfinder products by 2.5:1 in 2013.
And surprise, surprise, this is the exact opposite conclusion to that in the thread title

.