Enlighten me please, if you want your players (thousands of them) to go through the process of changing their IP constantly (something which some of them can't do because of their ISP) doesn't it mean that the Attacker can do the exact same thing, hence making this whole hustle pointless?
What is stopping Godxd (the ddoser on Asmo side Lv9 Sorc) who announces the DDOS literally seconds before it happens to do the EXACT SAME thing to bypass your protection and keep DDOSing the server?
Didn't this happen yesterday even after you implemented the new protection? He shut down the server after Siege (on EB time, hence why you had to gives tens of EB Reset scrolls today) while typing on LFG how much he likes Lulu.
The change you made yourselves killed the will of the players to play the server more than anything in the server's history, more than people jumping to GC, more than the server fire, more than random GP reset, more than the DDOS itself. They can't play the game, the administration itself does not want them, they are not welcome.
And do not kid yourself, they are your customers, you are not doing anyone a favor. You are making thousands of € out of it monthly. I doubt you could make even the 1/10th of that in real life.