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I think that much of the stuff that is available for "free" as in "gratis" (core, modules, themes, etc) is because of the fact that many of those who code for the community and give their time for the good of XOOPS more generally are professionals and earn their living coding.
Take as examples DJ (phppp, our lead dev) and the Instant Zero gang (Hervé, Marco, Phillou (I think!))..... coding and websites are their livelihoods, how they keep a roof over their heads and pay their bills. Is it so wrong for them to make people aware their professional services on here?
I don't personally think so and remember, too, that the code and modules they write as part of a paid-for service today will inevitably filter down into free-to-the-end-user modules and core code tomorrow.