+1 to what Tyryt says. At least this is the way it should be. The traditional MMO model does not apply to 40K, and this is something that the devs seem to know quite well.

We may not get loot, but with requisition points we get to function more in line of an actual army, proving your worth in battle before being entrusted with the rearer equipment, not actually purchasing it. Besides, it's just unrealistic to be looting during a battle, not even Lootas would do that (or would they?).

I would still like some sort of looting system.

I'm only seeing the trophy idea. I don't think a Lictor would drop master crafted bolters or something and I don't think factions like the Eldar can possibly get useful materials from a dead marine. We sing our guns into existence.
Come to think of it, that makes it strange that Eldar would need manufactorums for their tanks too.

One thing I still want to know is what exactly does one faction get from winning a war. When the main campaign ends after around 3 months, what possible rewards will the victorious crusaders get?

The only loot I want to see from killing players/creatures are cosmetic trophies.

for your armour or your hall?

Both

I don't want cosmetics for armor only for real money. I wouldn't buy anyone. I want to earn my trophies on the field.

Guild Wars seems to manage pushing content twice a month no problem, and we don't directly pay for it. I assume there will be micro transactions for those who want to have the extra decals/trinkets/skins, I know I will