Freya has a slightly higher economy spending base. Depending on the item it can cost quite a sum (but at times not as much), example: rune of Agility/Intelligence/Strength of 50 in Freya is usually closer to the 10k~12k mark whilst in Odin its lower around the 5k~8k mark.
Let's see with what you asked about (checking AH now): BlueSeed stacks go from 3k~5k, depending costume a 3s can go over 200k+ (not too different Odin), some Osiris weapons go between 20k~80k (if not more) at various refine numbers.
Part is influenced due to supply and demand.
I think last time we had a merge with another area server, they were given a chance to rename their characters.