If you mean most expensive item, its the Christmas cracker which is 710.7 million gp.
Since Runescape is a computer program, everything is stored as binary data. The Runescape gold amount for a player is stored as a 32-bit variable which means the most gold possible for an account is 2 to the power of 32 minus 1, which is the number 4,294,967,295.
If your question is what's the most valuable account, that's a bit more complicated. I'm pretty sure everything you can stack in your bank is tracked by a 32-bit variable, so it's possible to get up to approximately 4.3 billion items for a LOT of different things. If you had 4.3 billion party hats(which is impossible since there are less than 100k in the entire game) you would have money in the quadrillions(a 1 with 15 zeroes after it).
The max money on runescape is 2.147 bill (2 billion 147 million gp).
This is against Runescape code of conduct. If you need in game money you can use real life money to buy a bond on the Runescape website, then sell that in game.
Usually Runescape money, however it can be different!
noob
No.
There are no money cheats in RuneScape.
Earn RuneScape money yourself and stop relying on money generators.
Blue partyhat costing 2100M
You can't get infinite gold on runescape.
There are various Runescape money making methods, however there is no hacks/cheats you can download to duplicate money or items.
Manta Ray sells the most, but sharks over-all are best for making money.
Runescape money is used for several things throughout the game. One would need Runescape money for things such as skills, magic, firemaking and cooking, crafting and prayer.
No but it's against the rules of runescape
No.
Get money
The max money on runescape is 2.147 bill (2 billion 147 million gp).
Websites such as Download That and File Guru offer a free download of a Runescape money maker. There are a number of articles and videos on sites such as Youtube and Articles Base detailing how to make the most of the software.