hmm you say that on your experiment the O.S were like new, and the others were bad? (after the 3 days)
That really seems odd because organic food should decompose faster. One of the most important points for the "artificial" food is to last longer so it "survives" transport etc
There are a lot of selling points for GMO foods but surviving transport is probably not a major one.
Refrigeration can make a fresh strawberry last a very long time.
Chemicals can make processed strawberries last longer than twinkies
http://www.snopes.com/food/ingredient/twinkies.asp