Originally we planned 3 core packs, with 2 more unlocked with stretch goals, and we had a few ideas for big stretch goals (like the Legendary Creatures).
Well, a campaign has a live of it's own, that often takes it in new directions.
The "I Want It All" pack includes all 5 core packs, 2 panels of bases, and domestic shipping, plus any stretch goals that are NOT "add-ons", such as Legendary Creatures.
Add-Ons are NOT included, and were not part of our original model. The backers overwhelmingly requested 'extra packs' such as horde packs, collaborations, and anything else we could possibly offer. Of course, not all of these will appeal to all backers, so they all have their own additional costs, and are not part of the 'I Want It All' tier.