A better question is why do you care so much? This isn't some kind of national holiday you are missing out on, it's a company trying to get you to spend money. If you find the way the do it annoying - don't buy anything or shop elsewhere.
1. Natural curiosity. Amazon is big and successful and highly optimized. There's a reason for their strategy approach and presentation so I'd be curious to understand it and learn something.
2. It is suboptimal from my personal perspective as a consumer so I'm wondering how can it be / why isn't it optimized. Am I a weird edge case? Am I not falling for some trick I'm not even seeing?
3. Is the state of the art not as far along as I thought it might be?
Etc :)
Why would they optimize for your needs? You're already a loyal consumer, to the extent that you're vaguely upset about a missed opportunity to go on a spending spree.
It really seems more beneficial for them to just apply a markdown to items that are doing nothing but taking up space in their warehouses. If that's what they're doing, you're searching through the list of stuff they want to get rid of, so that's a win for them even if you don't buy anything (because it's not like you won't look through them next year; you said you've done it three times in a row already?)