I can see occasionally stocking up on books right before a vacation away from WiFi. But 50 per day would be excessive even for that purpose IMHO. You do have to allow for the unreadable junk that is out there on KU, but still, 50 per day? I could see maybe 20 stocked up before a multi-week vacation, hoping to find two that are actually worthwhile.
When I used KU (I don't anymore) I used it to go through a lot of books - skimming them quickly as an extended "Look Inside!" - to see if I wanted to add them to my "buy" list. Even doing that, I probably was closer to 50 per month than 50 per day most of the time. I hate to say it, but the vast majority did not make my "buy" list, only a few did. I would think that "books out at a time" would be a more useful thing to put limits on than "books per day". But I don't know what Amazon is trying to accomplish here. It's no doubt accomplishing something for them, not for the customer. I would call "50 per day" ... "unlimited" basically. A limit that is functionally a non-limit.
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