I made 4 secondary accounts (I'm not obsessive enough to actually continue playing these spare games, but they did really help me get extra Halloween treats). I just bought the last Halloween item this morning (Burns monster) without having spent any real money throughout the event.
It takes about 30 minutes to have a secondary account up and running (as you need to go through the tutorial and Mayan artifact set-up). Not only do you get the tutorial/beginner donuts, but you also get the bonus 10 for answering the riddle from the Mayan dude. Squish your zombies, and you have tp and eggs to throw at your main game after you friend yourself. But the big bonus comes in using those beginner donuts. Spend them all on the Halloween Mystery boxes to get a ton more tp and eggs. At the end of that half-hour it took you to set this all up, you should have 80--100 tp and eggs. With them, ransack your main game. As only 1 every 4--5 will yield a treat on your main game, when you go to clean up your Springfield, you should expect to acquire 20--30 treats.
So that's 20 treats for spending 30 minutes. Create 4 secondary games, it'll take you 2 hours to get 80 treats, guaranteed. Not bad. You can make more even, if you want, but I stopped at 4. I haven't deleted my secondary games yet, but I plan to, as getting notifications from all of them on the same device is annoying.
And like the others said, don't forget to collect from your friends' cemeteries and other treat-giving buildings. A good time-saving tip: When you get to the town-scrolling screen, instead of visiting your friends alphabetically, select the little orange Origin icon at the bottom left. Go to the "My Friends" tab to bring up your list. It shows you the times that each last logged in. Visit the friends who haven't logged in for 10 hours first, as their graveyards are ready. And remember, even if they only have one graveyard, you can collect three times. Just collect the treat, exit the town, then immediately return. It'll be refreshed.
You have more than two weeks still, so don't worry; there's more than enough time. :)
--Julia
