So a queen after going on a killing spree may finally worth more than the king. Feminists will like this!
Seems like an interesting variant, to spice things up. It's a YES from me.
Suggestion: Dynamic points

So a queen after going on a killing spree may finally worth more than the king. Feminists will like this!
Seems like an interesting variant, to spice things up. It's a YES from me.
(Inspired by our discussion in https://www.chess.com/clubs/forum/view/suggestion-capturing-dead-grey-pieces-earns-0-5-points )
This may be a good idea to change the value of pieces this way: If some piece (or pawn) captures another piece (or pawn) its value increases by +1.
Real world analogy: Your soldier becomes more experienced, skilled, a veteran.
Example: You have a bishop (5 points). You take a pawn with this bishop, the bishop's "price" becomes 6.
This way we can force people to think a little more before they do some unneeded piece exchange. And this adds some additional layer to this game (see Example 3) below).
Some more examples:
1) You take an enemy's pawn with your pawn, you get 1 point and your pawn is now worth 2 points. Your enemy takes your pawn and earns 2 points.
2) You take an enemy's bishop with your knight, you get 5 points and your knight is now worth 4 points. Your enemy takes your knight and earns 4 points.
3) You take 3 enemy's pawns with your pawn, and your pawn is now worth 4 points. Your enemies stop chasing your knight and instead start fighting one another (and each other) to capture your super pawn.
P.P.S.
I remember there was an idea to increase the value of promoted queens from 1 to 9 (every move with +1 increment). These 2 ideas do not contradict.