Not sure what dollars you are referring to. Canadian? Australian? Sure, the R9 Fury is faster, but it also costs more (and uses more power, produces more heat). I consider the R9 Fury more like a bridge between the 980 and 980Ti. At intruduction, the R9 Fury was priced at $520US, and the 980 was priced at $470US. It's really a card in its own category.
Regarding multiple GPU support, it's hit or miss depending on games no matter which GPU manufacturer you go with. For example, in Far Cry 4, AMD was behind Nvidia (the blame was put on the developer, but I call BS since just like Project Cars that AMD users also complained about, the developer gave equal access to both GPU makers to tinker drivers with). But my experience as a long time 3-generation SLI owner and former Crossfire owner, I have seen an increase of games being released with poor multi-GPU scaling or no support at all up front.
This is the main reason I'm hoping to hold out for a single high end GPU replacement in the next year either with Pascal or Polaris, whichever offers the better single card high end solution (today's 980Ti and R9 Fury X).