Your numbers are great, and congratulations. That said, I will guess that you are leaving money on the table by not having a wider target audience for your marketing.
Also, the idea that a company is “better at marketing than at converting” isn’t really the correct way to look at it. Basically the math says that you want to keep increasing the width of the net you cast as long as it is profitable. In some cases, you will find a profitable group to market to, but the reasonable conversion rate for that market (i.e., people who end up loving or product) is just naturally lower than your high-conversion group.
As a simple example, someone may have a very technical finance newsletter that they sell to finance professionals, and they covert that group at a high rate (and a high price). This newsletter can probably also target HNW individual investors profitably, but they will not likely have the same conversion rate.