Stable income: Somewhat stable

Selling RuneScape accounts can be a lucrative side hustle with the potential for consistent income. Setup costs range from $0 to $50, mainly involving time investment to level up accounts. Based on online discussions and observations, some sellers consistently earn a steady income by selling high-level accounts, while others experience fluctuations due to market demand. If your best friend were to pursue this full-time, I would cautiously say, 'That's a risk,' as success can vary. Overall, I'd rate this opportunity a 3 out of 5 because while it offers a decent baseline income, it can be unreliable at times.