While black-market gold is often significantly cheaper than official bonds, the associated risks have increased as Jagex has adopted a "no more Mr. Nice Guy" policy toward buyers. Rules of RuneScape - Legal Portal - Jagex
Buying Old School RuneScape (OSRS) gold through third-party sellers is a violation of Jagex’s terms of service that can result in permanent account bans, item confiscation, or severe security risks like account theft. The only officially sanctioned method to "buy" gold is by purchasing directly from Jagex or the in-game store , which can then be sold to other players on the Grand Exchange for in-game currency (GP). Market Analysis: Third-Party vs. Official Bonds buy old school runescape gold