First, that actually is, to Disney, "nothing". FP+ slots cost them nothing. Hundreds of them probably go unused every day, but they aren't counting that as a profit to the company - unlike, say, if they were giving out $5 gift cards to everyone and hundreds went unused. Second, you say that as if it's a bad thing. Each TICKET is entitled to 3 FP+ per day. There is nothing that says each PARK VISITOR is only entitled to 3 FP+ per day. Put another way, suppose someone had a ticket, entered the park, did their three FP+, left at lunch and lost the ticket (we'll pretend there is absolutely no way of getting the info again, like back with paper tickets) and they had to buy ANOTHER ticket when they went back in the afternoon, and that ticket also had 3 FP+ allowed on it. Do you REALLY think that person should say to themselves, "Well, technically I already did my 3 rides, so I'd better not get any more FP+, because that would be wrong, even though I HAVE PAID FOR THEM."? Because that sounds crazy to me.