No matter how low your CPL is, if you generate higher quality leads, these will be more likely to convert, which means higher ROI in the long-run.

This statement is true. While a low Cost Per Lead (CPL) is desirable, the ultimate goal of lead generation is to acquire leads that convert into customers, thus driving revenue and a positive Return on Investment (ROI). Higher quality leads, even if they cost slightly more initially, are more likely to progress through the sales funnel and become paying customers. This increased conversion rate directly translates to a better ROI in the long run, as the value gained from these customers outweighs the acquisition cost. Focusing solely on a low CPL without considering lead quality can result in a high volume of unqualified leads that never convert, leading to wasted resources and a poor ROI.