Wow, I thought buying a Mac for my family would be a great idea. Now, however, with six of us trying to use our Apple IDs on the same computer, we can't download the music we already purchased. We are constantly being punished for trying to use a different Apple ID. Really, really, a bad idea. My little girls are wondering "why is Apple so stupid?". (Not my words)
What should I tell them? "Sorry sweetheart, you can't listen to One Direction on your Mac because.... uh. Yeah, you are licensed for five computers but daddy synced his music within the last 90 days. You have to wait 61 more days. Apple is worried about little girls like you. You might try to steal music. Even though you have been buying it all from iTunes, you could change and start trying to copy things illegally. You might turn out to be a horrible little girl, actually."