The core reason is that Jagex does not allocate nearly enough funds in to botbusting and anti-cheating. It's ridiculous to even hope to get a handful of people, like 4 or 3, to capture any significant amount of rulebreaking.Archeage did to golden buyers. Gold will be removed and any items bought with the gold would be as well. People would lose tens of thousands of dollars worth of gold and silver items.
OSRS gold
https://www.rsgoldfast.com/