I agree no organiser would pay for something that is currently free.
Of course... but you can't get large quantities and certainly you can't rely on riders "bringing their own", as you know half of them won't and after all you are there to run an event, not to be a cop.
Of course, I have also worked out that if you run a lot of events, you can turn quite a big profit by charging for test to everyone and making 10 quid per rider that doesn't show up (provided these tests have a long enough shelf life), but I don't think any organiser worth their salt will be interested in "making money" this way.
Anyway, I detect a level of sarcasm and non-constructive targeted criticism around which is frankly annoying. We don't have to have this conversation, or any conversation, for what that matters.