Please spare me the IIHF BS, The only reason IIHF rules are so different is because their stuck up euros who hate the way hockey was played in NA. Hell, the original world championship was "euro" only until 1920, and even then special euro medals were given out until 1991. IIHF caters to euros, and i don't see why NHL should even bother with their silly "exhibition".
Replace 'europe' with 'outside north america' and you get closer.
NHL and IIHF isn't the same sort of organisations.
NHL is commercial entity selling their main product, proffesional icehockey, to a mainly north american market base (but they don't mind getting a bigger base if they can).
IIHF is the governing body elected by all the national hockey federations, with their goal to spread the game of hockey on all levels and on all continents.
IIHF appears 100% european because the only stuff we see or hear about is Olympics and the top division. And of the normally 16 teams qualified, 2 are north american, the remaining 14 are european (or possibly one asian if Kazakstan stays in the top division) but it's not by selection, it's by qualification.
But there's 3-4 more divisions, who also play IIHF world championships (which also act as qualification to Olympics) but we never see or hear anything about it except possibly for a short notice stating which two teams that will have spot 15 and 16 in the 'real' tournament.
IIHF works to develop hockey in asia, aussie/nz, south and central america, africa and under developt (hockey wise) parts of europe.
NHL on their hand works to develop their product and markets.
The reason we see all the clashing between NHL and IIHF is that they are the two big and influential organisations.
Until quite recently all the european national leagues was run by the national federations, but the top leagues are becoming their own commerical entities, and they are growing in power.
The russian hockey federation isn't dictating anything for the RSL anymore, rather the reverse. SEL and others are also shifting power away from the federations. They still (except the russian) are still using IIHF as negotiations vehicle, because they aren't big enough on their own, but this might change. We might get a 'european prohockey association' or something, made up from the proffesional leagues, not the federations.
And that's something that IIHF fears more than anything.
If this 'EPA' would form, owned by the top euro leagues, and do their own negotiations directly with NHL, IIHF would become a lame duck. Just as the US and Canadian hockey federations are today.
That's why IIHF is pushing the new champions league thingy, trying to stay in control, and on the good side, of the euro leagues.