[Oni]

i don't really have an idea of how finances with domains works, but could you make any money out of it

There certainly Is money to be made.

I've sold a few premium domains that I purchased at the regular cost, namely those that have expired due to the owner not renewing the domain.

When all the new TLDs came out, I'm sure many got rich overnight. It's very lucrative to businesses/influencers.