999,999,999 is the cap from way back(and current) for the amount of coins in merchant / trade max.
2 pacthes later the economics of teh game have changed, hence the money cap should have changed, however we are opressed by a fuedel [ old ] trading system.
K2 should have increased its noah cap by at 2-10 times depending on how you justify your argument.
You could say items are roughly 10x more in Price level than in old skool hence people are paying ten tiems more and need to be ably to pay 999,999,999 x10 in a trade( i suck at maths better wiht words).
ne not like it matters to me ive never had mroe than 170M in hand at once.