Eh... on the face of it, maybe. Sounds like there's either legality issues involved (either with the service's... service, in certain areas, or with google operating in them) or they're running basic profitability trials... would guess on the latter, really. You run a few months/years of one pricing plan in a few areas, the other in others, see what kind of data pops out. Tweak things regionally if you can, too. Europe in general might be more compatible profit wise with the 10$/mo (equivalent) one, but maybe specifically germany and belgium generate higher margins with the other, for example. Have to be careful with it, though, since it's hard to recover from notably increasing a charge in anything approaching short order,* which is probably why a monthly doesn't seem to be being rolled out en masse, at the moment. Stuff like red you have to take into account regional differences in use, too. Can be complicated if you're actually trying to fine tune and optimize instead of just going with good enough, heh.
*Never looked up what common rates for that are, but if I had to guess off the cuff I'd wager around 5-10% increase every six to twelve months being around the limit before people stop grumbling and start looking for alternatives. Depends on the amount of the cost being adjusted, too, though...