Ben, this community is not trying to make you upset. It is defending itself against possibly ever being accused of harboring illegal activities. ‘Quaddicted’, is an archive; I believe we want it to last and not get into legal trouble for some idiocy. Let me hopefully give you a comprehensible picture of what is wrong with your offer - in my opinion, at least - in case you had any doubts:
You would not go and sell ‘Quake’ just like that, in order to make personal, monetary profit; because you know ‘Quake’ is copyrighted and in a legal sense, does not belong to you. I mean, I hope you would not.
This, goes further. Being a mapper and a modder, you know a game consists of various elements, such as, for example: textures, models, skins, skyboxes, sounds, soundtrack, as well as certain distinguishable code segments. You see, if you break down the game into these smaller pieces, it comes out these pieces, are copyrighted too! That means, you cannot take them and sell them separately from the game; such as you cannot sell the game itself. You cannot, unless you have a licence, which I assume, you do not have.
In your maps, you sell exactly these “copyrighted” elements, while these, belong to ‘Quake’ and ‘Quake’, belongs to ‘id Software’. It all means you are legally forbidden to make money on it.
Under what circumstances could you possibly make money on your maps? In case all of your assets, were custom - made by you, your coworkers or your legal contractors.
Having that said, I hope you can make the right decision. If you cannot, due to different sensibility according to what is legal or “fair play”, I am sorry. Unless you withdraw the money charge for your maps, I am afraid every attempt to advertise your commercial endeavors of such kind on this forum, are going to get taken down, eventually leading to having your account, banned.
I believe you can still share your maps in actual state, for free, thanks to the courtesy of ‘id Software’ in regards to modding and mapping scene.