Keep in mind how often pro's play, we are talking multiple rounds a day, and the rate at which their discs season is exponentially higher when compared to you and I. More often then not I see people carrying 3-4 of the same mold to "be like the pros", but they are all fairly new and fly the exact same. I would recommend finding those 5-7 molds that are your go to's, buy back ups, and then cycle the backups in once your primary throwers are truly seasoned/not true to the numbers. There are obviously exceptions to this rule, i.e. not all plastics for a given mold fly the same etc.
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Aw man I was going to say that^
I think most pros cycle discs because they like the feel of specific discs in their hand even down to different runs of the same mold. Using the same mold gives the same feel in your hand. Also, if pros didn't cycle discs then once a disc was beat up it would be of little use to them.