Postcard comp entries, two queries

1.With modem automated computer entry systems at the handling house end, are coloured postcards worth buying as opposed to plain postcards? Does it make the slightest difference which type is used given the context described...?

2. Additionally, I'd be most interested to hear from anyone who in the >last two years< has won a BIG prize via the p/card mailing route and did you employ an illustrated or nondescript postcard? 
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