It's more like these griefers don't want to fight.

One war was very funny because I spent hours in space in my covops. Never saw other ships on same grid. I thought they wanted to fight, but I guess I was wrong.

I'm not sure what point you're trying to make, but for your benefit I'm going to describe what happens when you sit cloaked in a covert ops ship during a war.

1. Locator agent comes back saying you are in space.
2. Neutral scout is sent to your location.
3. Scout confirms that you aren't docked in any of the stations, aren't on grid at any of the celestials, aren't sitting at a POS, aren't mining and aren't running missions or anoms.
4. It is decided that you're cloaked most likely several hundred kilometers off a gate.
5. Your war targets intentionally avoid the system you are in so that you don't report their location to your corp/alliance mates.

Possible pricing:

if (defender is larger) = base_fee + totalsize_fee * totalsize^1/4 - diff_fee * diff_size^1/5
if (defender is smaller) = base_fee + totalsize_fee * totalsize^1/4 + diff_fee * diff_size^1/5
Minimum size for attacker/defender is calculated as 20 on each side.

Base Fee = 40M
Multiplier based on total size = 80M
Multiplier based on size diff = 40M

20 attk 20 = 241M
20 attk 1000 = 334M
20 attk 8000 = 556M

1000 attk 20 = 651M
1000 attk 1000 = 575M
1000 attk 8000 = 584M

8000 attk 20 = 1038M
8000 attk 1000 = 1054M
8000 attk 8000 = 940M

It does mean that wars are more expensive at the low-end of the scale, but the N^1/4 scaling means that wars never get ridiculously expensive.

There should also be some sort of multiplier that additional wardecs on top of what you have are more and more expensive (just like now).

Size difference may also be better calculated as a ratio of attacker/defender, with a minimum of 20 for each.

Why do you guys need to go and find some new possibilities for the wardec fee system ?

I agree that lots of things need to change, nearly everything that CCP has proposed in that new system looks pretty great, they made huge work on the killboard concept, etc.

But what is not broken or not destroying the game does not need to be changed.

And in this case, 25 mil per week for a corp, 50 mil per week for an alliance, is fine. There is literally no reason behind changing it.

Hey shut up man, he's winning.

1. Assumption
2. Assumption
3. Opinion

You missed the part where the fee also adds on 500,000 ISK per member in the defender corporation.