Everything about upgrading skills

Just wanted to gather some basic info about upgrading skills into one thread.
For example:
How much power do aoe skills have with each lvl?
Do all/only 90 power skills lose pp when fully upgraded?
What do you think are the best skills to upgrade?

Does skills lose pp when upgraded?

5 Power per +, exceptions are Iajutsu and Frenzied where it is lower (don't know how much they get).
No skills, or at lest offensive skills lose PP
On Monster that have a 120 damaged than self Stuns without weather, boost 90 Power skills is my recommendation, for Massive Boulder or Aurora, boost that.

Frenzied _ every upgrade will add +1 damage .
lajiutsu_every upgrade will add +2.5 damage .
All the other skills _ every upgrade will add +5 damage .
***
1st upgrade = 100K money
2nd ugrade = 200K
3rd upgrade = 300K
4rth upgrade = 400K
5th upgrade = not sure
6th upgrade = 1M money

Not sure about the number of EoW ...

My poison leaf become 3/3 after upgrade it to +6. The odd thing is when I use it in battle, the pp become 5/3. I already report the bug. I wish I turn out to be 5/5 after the fix.

Aoe skills don't get +5 each time. My electrical storm +1 was 60 power but +2 is only 62.

As for the essence per upgrade, I'm pretty sure it's 20, 40, 60, 80, 100, 200.
This could be wrong since I haven't gone past 4 yet but just going off what I heard. Keep any additional info/opinions coming, I'll eventually edit my original post to include all the info we get.

Swindle become AOE after +1
Lethal powder become deadly poison after +1 ( no need to use twice to get deadly poison).

My mind is blowing at this thread. Why is all of this stuff not public of the price of upgrading is so high.

My mind is blowing at this thread. Why is all of this stuff not public of the price of upgrading is so high.

Exactly why I made this thread lol

I hadn't run into any mention of all these extra effects in other topics and all of the "it lowers PP" nonsense was because of the release that introduced upgrading also lowered the PP of a lot of stuff.

Anyway, does anyone know if status effect inducing spells like Electric Net target all enemies when upgraded or any individual buffs target both teammates?