I could just repeat what I wrote before. absolutely not challanging - Ofc it is challanging, you could check the ranking ingame (n -> Rep. Rankings) and see that it is not full of 200kk players yet (Isn't working atm, should be back soon I guess).And if you do those 25k rep raids only (for pve players e.g.), you still need to do 8.000 raids and that is a lot of work. not worthit / you get nothing out of it - Why are you playing games? It's not because you earn money from it or something else. You just do it for fun, don't you? For some players (like me) it is worth to have a lot of rep, because it's fun and a goal some players want to reach (having 200kk rep). For pve it's not really worth to level up to c50 too but some players do that because it looks better -> not worth?
I don't think reducing everyone's rep is a good way to handle this. You can compare it with reducing everyone's gold by 20%. Not many players really liked that.
But I do agree with the basic idea to do more about reputation in Nostale. Like inserting new icons (10kk rep, 20kk rep, 50kk rep, 100kk rep, 200kk rep) or just raising the reputation limit to 500kk for example.