Totally agree. I can bet most votes for x300 rates are just sabotage votes to make realm vulnerable to trolls, noobs, idiots etc. Using some kind of formula proposed by Luhox in my opinion is quite just and should be fair enough for whole player base agreement.
Also putting my two pennies worth in; lower rates would make realm more idiot-proof, troll-proof and so on, but on the other hand as dev mentioned earlier lower rates would be not a good choice because of the technical possibilities, so as it being said: some sort of formula trying to balance peoples will is in my opinion best choice.
I've almost forgot... keep money rates quite low; since i'm playing on x100 realm, economy there barely exists and it hurts a lot.