If you're paying full price just to get the neutral cards then you're very much 'doing it wrong'. From Ebay (either buying cards alone or selling minis alone) to paper printouts, there will be a plethora of better options.
Sure it's not the most consumer friendly way of distributing the extra neutrals, but I find it hard to begrudge them too much for wanting to push sales. When they start releasing Magic style random blind packs, then is the time to complain!