Or maybe it a desire to reduce desk spaghetti and free up power outlets.
I love my Corcomp 9900. But once I have the TI, the Corcomp with its insanely huge wall-wart, the Tex'n'Treasure 3.5 floppy disk with its brick and maybe the Gotek aswell, the desk looks like the fire dept at a major incident and I've lost 6 or more outlets. I love the FinalGrom and @jedimatt42 32K board precisely because I can quickly set up the TI and play some awesome games.
I mean if this was really about people too cheap to spring for a $10 power supply we'd all just emulate.