It was totally bad idea to scale pachinko with levels.
After some leveling cost of that game became too great and with increased cost of affection levels players became punished for having a big harem and active playing. Especially the ones which donate for event girls.
So cost of the pachinko must rebelanced and "player level" must be removed from there.

For income player have two major sources: bosses and girls.
Last boss giving about 60k per hour and girls giving about 1.2k per hour (event ones with 3 stars).
So in order to add equality for the players cost of the pachincko must be scaled to the finished chapter and # of girls. Something like:

1 roll cost 1/30 of the best available to player troll's per hour money (2k from the last one) + 40 (1/30 from 1.2k girl's per hour) * harems size.

So for me (last troll and 55 girls) 1 roll will cost 4.200 (or 42.000 for x10) and for new player (Dark Lord and 3 girls) 1 roll will cost 420 (4.200 for x10)
So at and I will pay x10 more, but my income is x10 more too.