Each person has their own level of natural ability.
And in a free (or 'good as free/cost of a pint') sociable evening, I believe there is a completely valid place for those with a lower level of natural ability. And some people, perhaps the very elderly in particular, will have limitations on what they are capable of achieving.

If I were paying to see a performance, I'd expect a good standard as 'default'.

If I were given an evenings worth of free rough homebrew at a little gathering of friends, that'd be a great evening!
If I'd payed a tenner for what I thought would be a great bottle of wine and it tasted like vinegar, I'd be badly pee'd off!