Stable income: Somewhat stable

Selling Notion templates can offer a moderately stable income source for most people who try it. Based on online research and my own observations, some sellers do earn consistently, while others may experience fluctuations in income. If your best friend quit their job to pursue this full-time, I would say there is a decent baseline of income but with some unpredictability at times. I'd rate it a 3 out of 5 because while it can provide a reliable income stream for many, there are still factors that can lead to fluctuations in earnings.