> "Wouldn't a Raspberry pi for 1/20 of the cost, and which can drive a full HD video, be sufficient?" Not for arbitrary arrays of potentially-disparate display

> "Wouldn't a Raspberry pi for 1/20 of the cost, and which can drive a full HD video, be sufficient?" Not for arbitrary arrays of potentially-disparate displays -- which is where a lot of signage software is going/has gone (being able to marry varying display technologies, resolutions, dpi, etc). While they likely don't need to wring every last flop out of an i5, they do need to be capable of substantially more than driving canned video to a single HD display. And the more displays an off-the-shelf unit can drive, the cheaper/easier installation and expansion becomes.