Earlier quoted context omitted.
Why? What they're selling is not just the novelty, but the scarcity of an object. Treating these like talking greeting cards is like treating art as paper and ink.
It is novel. So novel, perhaps, that people won't be willing to pay a lot of money for it. Coin cell batteries won't last long playing albums, and are expensive to replace. The value proposition just isn't there for the end-user except for very limited novelty purposes. However, it might be there for people who essentially want to advertise their real product (perhaps a CD release, perhaps something else). Sell these…
The battery is rechargeable through the headphone jack. Quite ingenious actually.