3D is cheaper than non-3D, but the conversion rate is worse, that’s why merchants selling to the general public (lots of people who can’t handle 3D) sometimes skip it.
Thanks for pointing this out. Are you referring to this?
I am wondering to what extend this applies to Amazon due to the uniquely large and diverse payments structure. I guess Amazon is very data driven here and does this to maximize revenue. And conversion is certainly a big factor.
Have you tried contacting amazon support? What did they say?