Confused about The Hunt

[AriaEnia]

IF you see a monster lv 50 or 60 with blue marker, it's a B rank and it's not aggressive.
If it's red, it's an A or S.

No, there's no rewards if you kill a "B" rank monsters (blue one) if you havent taken a bounty for it.
So you better leave them, or inform people that you have spotted them in an area, other people might need to kill them.
If it's A or S, yes you'll get rewards just by killing them.

If you don't join a party and still participating the fight, you'll only get small rewards, due to your small contributions.
Except for solo tanks that can reap max rewards just by spamming enmity alone. So get tanks when hunting, they can easily carry you for max rewards.