Honestly, I never used this benefit...
Most Toys to Life purchases favored you waiting them out and buying at Best Buy when there was a promo+GCU or on the Toys R Us website when they had buy X get X promos.
Save for the random store exclusives Zelda figures or Player 2 variants, there really hasn't been any Amiibo in the past year or so that really NEEDED preordering, or was necessarily worth picking up on day 1 unless you wanted it NOW.
CEs are just an area that make little sense to me unless you're a super-fan of the franchise, as it's frequently just some weird swag bundled with game soundtrack and a book (artbook, guide, etc) of wildly varying quality.
I guess if you're the sort who's running a side hustle where you're picking these up on a discount and relisting them directly to ebay or even just right back on Amazon, this could be a big ding and a loss to you. But I kind of expect that in it's data Amazon probably sees that very few people actually use this benefit, and the few that do abuse it as much as possible.