Build the DDDD up and let us see what it looks like. Spin one with an LCD as well, 7seg or dot matrix. Lets see the resulting feedback on each version. You have to build something that will sell, if everyone responding doesnt like it, it probably wont sell. Yes, you can only make some of the people happy some of the time, not everyone happy all the time.
Ive built and owned a binary clock and I can say that it doesnt take long to train oneself to know what time it displayed. That is time, and you may have the time to determine what time it is, but standard 7seg clock is much faster to "read".
I want to know the amount of current being drawn "instantly". I finally own a power supply with voltage and current displays and I really like knowing at a glance what the output is, and I REALLY like having constant current mode. Would I buy another power supply without these features? No! And I am actively looking for another PSU to complement the one I have, just higher current. Yes, a small USB PSU would be nice to have, provided the feature set is there. Do I want a uSupply? Hell yes! That unit has great features, provided you dont try cost cutting it down to a price point.
Chris