Now that the arches are on fire how about redistributing these costs a bit to
increase character variation on other than last 10 levels ?

Advancing from level 1 to 50 would cost you 6188314 experience points.
Advancing from level 1 to 60 would cost you 20346531 experience points.
Advancing from level 1 to 70 would cost you 35847927 experience points.
Advancing from level 1 to 80 would cost you 60936630 experience points.
Advancing from level 1 to 90 would cost you 102211193 experience points.
Advancing from level 1 to 100 would cost you 322097175 experience points.

And NO, I don't mean doubling the costs on lower levels, just ridistributing
the total cost.

\o/