Problem is if Transports are going to be that expensive, people will start buying before new version arrives and thus make big money out of them...
When i started here i did not know anybody and did not wanted any help, so it took me bout 15 hours to buy me humpback, i traded whole week with it and then bought me train, so you see if you wanna make traders extra expensive you need to add them more cargo(i bet that adv. train had more then 5k cargo). So if ya want to transport cost 900mill it has to have like 20k cargo..... So i dont like that idea to much......
And i dont have that kind of money on all my chars, yes i tend to trade, but i also spent it fast....