I never advised not to make purchases through MyPoints. I stated a while ago that I saw too many participants of the MyPoints program have to contact customer service in order to get their points earned through making a purchase. My statement was that I use MyPoints simply for the free point opportunities and still manage to rack up close to 20,000 points a year.
As far as making purchases online, I never set foot in a single store over the holiday season and pointed and clicked my way to Santa's sleigh!
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