I purchased 10 fortune cookies total, which means I spent 500 LT (most of which was saved up from events and whatnot). I knew the expire date for the first batch was steadily approaching, but I also knew that I really want the birch background. I don't see new fortune cookies slowing down anytime soon, and with the high chance of duplicates I let those cookies expire nearly without a second thought. I managed to collect about half of the Marshal & Rosie cookie, but only two or three Filbert cookie items, which is just fine by me.
Honestly, I think it's good that you are out of the "gotta collect em all mentality" because by this time next year we might have already had a dozen or more cookies, and collecting every item from every cookie would be far more money than any reasonable (or sane) person should ever consider spending on a silly mobile app.
Perhaps all of these cookie items will be added to the Switch version that we may never get. Perhaps they will remain exclusive items to PC that you can bring over to your camp as an unorderable/untradable item. Maybe the cookies will repeat, or maybe there will be a major sale on LT that will make it more affordable to buy some cookies. Too many questions to justify spending so much money. I'm curious how this will all play out though.