You can't farm a lot on paladin. You can't take a double difference with 2nd place. Coz your score depends on your teammates (mostly on berserkers). You can farm much more, than usually if there are a lot of orcs, which kill everyone. You can not farm more than one overgeared and skilled farmer if you will heal only (mostly) him.
But when your team is good - you will be at the first place. You can take a look on russian tournaments.

I hope that it was understandable.

Ok, i got it, thanks.

As a healer, you often stay in the second line of battle right behind Zerks, Tanks and Frosties and your score will be influenced by:
- How many kills the first line gets;
- Your ability to stay alive - blocking Zerks' or Inquisitors' powerattacks / activating Mana Powder so the Tank can keep the shield up for a long time.

If you manage to stay alive in the heat of the battle, you'll accumulate points with each enemy death. By personal experience, the ammount of points can be obtained by:
- Healing (LMButton) each person who damages the enemy (even if they have full HP);
- Restoration Healing (RMButton) each person who damages the enemy (even if they have full HP) - major score boost;
- Healing Powder activated;
- Mana Powder activated.

Other skills such as Sacrifice, Ressurection or Immunity may increase the ammount of points but i haven't tested/obtained them yet.

Conclusion:
- If your goal is to be topscore, make sure you Heal/Resto Heal every melee before every fight even if they have full HP (Not advisable since you will spend loads of mana and RestoHealing doesn't give CP which will delay the activation of Healing/Mana Powder);
- Keep your auras up all the time;
- As you level, you will get new skills which, when activated, increase the points on each "Support";
- If the orcs/frosties are getting most of the kills while you heal them and you manage to stay alive with your auras up, you will be topscore without even trying.

If you want to see me in action on my Lv9 Paladin (Spoiler: i'm a newb), follow my twitch stream http://www.twitch.tv/pqngaming or watch some games i recorded http://www.twitch.tv/pqngaming/videos

Why tank receive points each time they counter a shot/spell while healer only receive their points when an ennemy is killed? :/

It's easy to be on top when you team is way better than the other team, but when it's a tough fight, you will get less point, because you can't heal everybody (healing full hp mates give you support point ... that's stupid), you need to spend more time on your allies with low hp.

I'm sure a healing reward mechanic like Warhammer would be great. If an ally killed someone, you receive point for each heal even after the fight.

Or maybe, healing one low hp ally should grants way more point that healing everybody. The problem would be when your team takes too few damage

because on many maps have objects causing damage (fires)

The best Paladins don't just heal. You play the healing role, but your class title is still Paladin. Paladins are protectors, they're strong. So you must also throw yourself into the fight as well as healing to optimize your class and points.

You need to somehow watch the pro healers like Alpachino (All Star) and Pure Cure to understand how to utilize your class to the max and become first to third place in most matches.

Wah? One power attack is all it takes muahah ^^,

If you play with bad dps, I agree. Or if you want to have a good ratio instead of healing true dps that need perma healing. Any healer in first line get roflstomped by good sister of fire.

Anw I don't care. Victory is way more important than 300 or 400 points.