They reinvest the cash right back into development and production units. There is risk that this company will evaporate, however: https://www.pine64.org/philosophy/

None of us is as smart as all of us ~ Ken H. Blanchard At the core of our philosophy is the notion that PINE64 is a community platform. [...] The goal is to deliver ARM64 devices that you really wish to engage with and a platform that you want to be a part of.

As such, if you can help them source better quality IPS panels, I know a guy you should talk to.