If you don't want to be replacing sdcards every two weeks, you'll need to add a hard drive with an enclosure which will also need power. You'll also need an upgraded power supply for the pi. To deal with any sort of scale, you'll need more than one in a swarm. If you don't want them just out in the open air, you'll either need to coat them or put them in cases. It just all adds up to way more than a $5 ebay laptop with a broken screen that has 20x the performance.
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