I'm offended by this whole topic, and I'm probably just a little grateful that I don't know the identity of our friend Whosatthewheel. Putting together an Audax event doesn't just happen. Some of the intangibles are: working out a decent route, identifying where the controls are going to be and whether these controls can cope with and welcome the expected numbers, tweaking the route to meet AUK's requirements, etc. Even after you have an established event, you'd probably need to constantly review whatever is on offer, so it's an ongoing cost.
It's never £6 for nothing, or £6 for just a brevet card, or a brevet card and validation, or for a GPX file (which has nil material value, but is priceless as intellectual property).
What do I do with my surplus? Look after my controllers and helpers (who you may not even see on the day)? Make contributions to club funds? Pay for my own riding entry fees (grossly overpriced as they might seem)? Buy myself a beer as I worry about that last rider who hasn't yet finished (only to find out the rider finished hours ago and didn't let me know)? Buy myself another beer as I handle yet another rider query, or defending myself against accusations of profiteering? Frankly, that's my business (but hint; it's all of the above and more, but I'd pay attention to those beer references).
It's a good job there are a small number of people prepared to put in the effort. At times like this, I consider whether I should make Mrs DelphCyclist happy and allow others to continue the good work. (And yes, I'm happy to hide behind a pseudonym too, although I reckon I may have blown my cover on previous postings)
I think you may be in the wrong club, Whosatthewheel.