A product is worth promoting long-term when it keeps selling consistently and customers give good feedback. It should also match the interests of your audience and solve a real problem for them. If people buy it more than once or the company keeps improving it, that's a good sign it's stable. Another thing to look at is the commission rate and how often it pays out. A reliable product from a brand with good support makes long-term promotion easier. Promoting something that builds trust over time can even increase repeat clicks. What do you think are the most important signs that a product has long-term potential?