If you’re asking someone to submit content to your website, and the very first thing that person says in their response is, “Before you go any further, is this a paying gig?” and it’s not a paying gig, then what you should say is, “Sorry, no.” What you should not do is send a poorly worded boilerplate description of your website that doesn’t answer the original question in a straightforward manner, and then, when the person whose favor you are asking reiterates that they need to understand whether or not you intend to compensate them for their work, get all bent out of shape and snarky about it. You’ve wasted their time by not just answering the question.
I’m lucky because I have The Man looking after me, and before that I had a very solid and well-paying corporate writing gig, but I know too many freelance writers getting shafted by a system that runs on their talent but devalues their skill.
Drawing a comic is better than getting riled up about it. So actually, I did profit from the exchange.