What's your use case where you want more outputs than inputs? At home I run a Audiofuse 16Rig with a lot of ADAT expansion to get 32i/32o, but I only use like 6o, while every input is used.
The project just exposes everything the hardware can do, the audio codec chip used for the conversion is Burr-Brown PCM3168A 24-Bit, 96-kHz/192-kHz, 6-In/8-Out.
Some I can imagine are surround sound, multiple monitor pairs (including dedicated monitoring channels for different musicians or simply different outputs for mixing).