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).
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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!
No.
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