AF isn't free, never has been free and never will be free. In particular it's pretty bandwidth-intensive because you've got to force more stuff down the pipeline. The consoles, more than anything, are bandwidth-constrained, and realistically both operating at a step (resolution wise) above where they rightly should be operating [would be operating on a PC], so it should come as no surprise they're not using it to the full extent.
Besides, at 10ft+ away on a big TV, it's not massively noticeable, so from a development point of view, particularly in this stage of the life cycle, it's a way to free up bandwidth with no real noticeable impact except in the online gaming echo chamber.