@feld and in early/mid 2023, supply of ethernet testers was low, the notion of paying a lot, waiting months, only to blow it up on qualification testing... not appealing.
Then I landed a gig where the customer demanded 10G over copper, so it was worth buying.
That said, I'm recommending 10G over copper for a VERY VERY VERY long time; only use might be for WAPs. Otherwise just use glass.