Grega,
So what you are saying is this:
Let's say that there are 5 people in one server. Which the strongest one is 4.9M, second 91k and the other three 3k. (I'm taking easy numbers here)
Which combined makes it 5M, the average of that is 5/5 = 1M.
When the new player joins this server, he or she will earn power level when they die IF they stay below that average power level?
Well sounds fair enough, he or she just needs to learn play the game then...
Avenger, what if your crushed by a overpowered pure skilled one? Will that count him as a d*ck?
Besides the way you describe it, you just really don't like high power levels.
Do you disconnect from the server and connect back if you are too overpowered (to reset your power level)?
Guess not. To stop this overpowered madness is not possible... but also not impossible. Read on.
Then how about this:
To make it really balanced, then just make an option where you can just setup a static power level.
Which allows the power level to stay the same no matter what (dieng, killing, wishing, begging, even transformations, ... will not affect it).
Because for people that are skilled or not, it will be informative and challenging of how the game works.
Don't begin with, this will ruin the game or the whole dbz universe, it should be optional. Not as a core gameplay.
Look at Street fighter 2, all of the characters has the same amount health with limited technique damage.
But the real key to win this game is to understand what to do,
instead of just randomly bashing buttons and win the game (like tekken... which allows unskilled player to defeat skilled player with unknown button smashing with a specific character like "eddie" or "christine")
And this should be the same, which should not be in the hand of overpowered players or randomly spamming bomberman.
I'm not saying that you should make this game as a 2d dbz fighter game, just add an option that will allow you to setup a server with static power level on or off. This way the noobs will not be able to accuse you that you are too overpowered and won him OR the situation reversed.
This will also make it very good for clan competitions or someting... where you need to rely on your players instead powers...
Takes a while to read, but now... you should understand what I really mean.