This.
I've yet to see anyone come up with any sound argument that introducing paid content like this doesn't introduce a nasty conflict of interest for the future.
Yes there have been huge improvements - up until now - in the levelling curve, with dailies and instances along the way, but will there be as much incentive to continue to develop content for low to mid levels going forward? Same for developing pvm alternatives for VP, and anything else that might pop into this shop in the future as a 'fix'. How long before alien levels and research can be bought?
Worst case scenario, this becomes accepted, and instead of people asking for diversity, fixes and more fun/new content, they'll cry in the forums for it to be added to the shop :|