Some people need to get their head off their asses before they speak; PSP Monster Hunters NEVER HAD ANY SORT OF ONLINE PLAY, FREE OR NOT. It was previously available only to the PS2 versions, also pay-to-play.
On topic, see it this way :
Halo 3 just released and sold millions and millions; then, Bungie decides to toss into the market a port of Halo 1 to the next Xbox iteration bundled with a demo of Halo4.
NOTE: ported Halo 1 with nothing added at all, not better graphics, new content, etc. How would you expect it to sell!? If anything, all buyers would be those so hot for Halo4, almost noone buying Halo1 + demo for the port itself as they would already have two better options available in the market (also at a lower price) : Halo 2 & Halo 3 which have tons of new content and assets.
The same applies here: why millions and millions of people should flock to buy a expensive game they already own, while also having other versions offering so much more (MHP2G has twice the content MHP2 does-while the last has twice the content MHP1 has-which itself has much less content than MHG for PS2, now ported to Wii)? They only purchsed for the demo itself, and that shows tremendous loyalty to the series and its popularity nowadays.
I still stand by my prediction in my bet; about MHG, I think the Wii version will easily break 500k in Japan.
My themeforest portfolio:
