"why not" is not a good reason to "invest" in something.

If you/your wife decides to hold an asset, there should be a reason for it. Otherwise your investment decisions will be based on emotions, fear and greed, rather than knowledge and conviction. This will get you rekt in the market 100% guaranteed.

Cardano is just another centralized scam/shitcoin:

It's proof of stake, AKA fiat.

It was pre mined and sold by it's creators, like fiat.

That should be enough reason as to why not.

But sometimes it is a good exercise to study a shitcoin, take it apart, and come to the conclusion as to why it is bad yourself

I recommend reading some cope from the "community leaders", it's very educational;

https://www.reddit.com/r/cardano/comments/yk5xoh/myth_busting_premined_ada_is_a_big_issue_for/