[Molly]

How nice of you.

However, I don't share your opinion about those terms.
To me - and I suspect to several others - the constellation 'Professional - Hobbyist' has clear implications about lower quality in the latter.

We have already agreed to disagree about the definition of 'Free', and we are even less likely to reach a consensus about the definition of 'Professional', so let's drop that discussion too and get down to business.

'Commercial' - 'non Commercial' would have been acceptable to me, but I think Lasher's suggestion is better, it covers most bases and is probably less inflammable:

Sounds good to me. I cast my vote for that one.