RGB is only good for display on computer screens
That's generally true, but the majority of printers, both hi-end and low-end, have fully automatic RGB-> CMYK filters and don't blink at RGB. The hue shifts, saturation, gamut concerns, rich black etc. generally don't matter unless you are a professional printer concerned with color matching (and even then, *ahem*).

I wonder WHY they chose that blue. Were they hoping for a "non-repro" effect? Anybody remember those days?

... /end OT.