I think it's just simple economics- they would have weighed up the Google Play income they get from various markets and the benefits they get from subsidising the device in relation to that. I live in New Zealand which is just too small a market for them to worry about, even though it would be simple to ship here from Australia. We'll still get the device, like any other, but through LG's distributor's rather than from Google.
I still don't understand why they only sell this in some EU countries and not others. Friends in the know tell me it's something to do with certification which seems strange inside the EU.
But even if that's the case surely they could just show me the damn page and then tell me they can't ship to my address. That's what Amazon does for some things anyway. At least that way I could look at the damn thing and potentially have it shipped somewhere else.