The main reason for this is so that starting players can get a reasonable amount of gold without using the market at the start. That's why starter gear is currently placed at unreasonable prices. All that gear that you see that is level 15 that sells for 30k in the market wards will drop down to 3k. That gear that you see from NPCs that sell for 52k will drop to 5.2k.

Splitting your money between characters won't do anything. Even if you split it 99,999,999 x3, it will just drop down to 9,999,999 in each character. Some people may not like it because it doesn't affect them directly, but if new players find the economy to be as inflated as it is now the outcome will fare far worse. However as people have already mentioned, unless they add more effective gil sinks nothing is going to change in the long run.