HiFiberry products are good value, well-reviewed.
The big issue that prevents bigger sales is lack of really good tech data, and measurement specs, and "how to" and "how it does it do it" information... This leaves a lot of potential buyers wary, or confused and loses sales.
So this is not really a product idea, but a suggestion to employ a product manager to really ensure potential customers get all the useful data, to ensure they are confident about what they are hoping to buy..... It cannot really be achieved properly with potentially thousands of community questions.... I know, I have done several tech start-ups!