Personally, I try to also have fun when I work, but I understand that that's not everyone's situation.

That's neither here nor there, though. The argument is "the only time I do unfun things that benefit work is when I'm getting paid for them", not "I never do fun things at work".

How frequently do you consider taking psychedelics at work? I suspect I know the answer, and that you can see why that line of reasoning is a bit dishonest