Oh dang, I forgot again yesterday didn't I? Oh well, better late than never. It's kind of tough coming up with new poll questions nowadays, so let's try this.
What do you typically save your gran for? A lot of people have varying luck, and some people have their own theories on how gran is best spent... So what do you do with it all? I've excluded things that normally aren't purchased more than once, like Beginner Packs or the Starter Files.
Boxes - Packs ahoy! Buying in bulk is cheaper, if you're willing to commit to a single set. Usually a good buy when a new set launches.
Packs - Lotto doesn't cut it any more? Not feeling too lucky? Well, your good old friend the Pack always has a few 2*'s for you, at the very least. But is it better than boxes? Strictly by numbers, no, but some people theorize that you somehow get more rares...
Lotto (Pull as soon as you get gran) - You need as many cards as you can get, as soon as you can get them! After all, a card in your pool is a card you can use to win games.
Lotto (Save up to pull large numbers at once) - Some think that pulling in large numbers has a higher chance to get similar cards. Something about the RNG seed being based on time...? But some also think that it tends to be luckier as well, and are patient enough to wait until they save up for a larger pull.
Save for EX Packs - EX's can be pretty powerful, and it's usually gran well spent. Don't take your chances with the other options, EX Packs give you exactly what you expect.
Save for special events (Seasonal, etc) - There's always an event around the corner, and people are often complaining that they don't have the gran to afford it when it comes... So why not save up? Do you want 20 Salamanders from the regular lotto that badly instead?
Potions - Is leveling up or earning treasure battles more important than the usual methods? Sure, you could spend tons of gran on a box and pray for a 5*, but people that are a high enough level might benefit from getting some rare cards from level ups instead. Obviously, these would be for people who win lots...