Dumb question, but how much more would a YubiKey or something cost if they added a marginal amount of storage so it could hold an almost infinite amount of thes

Dumb question, but how much more would a YubiKey or something cost if they added a marginal amount of storage so it could hold an almost infinite amount of these keys? I’d imagine something like 32 Mb would allow you to already store 1000’s of keys.