The most probable counterarguments include a) the fact that patreon pledged money is always very deceptive, since the receiver has to pay the Patreon 5% cut, Patreon transaction costs, the taxes, the artist, someone else busy with something else and god knows what else (also mind that the current $6k are a record-high - it was way less just several months ago, no telling how sustainable it is) and b) this tricky thing called artistic integrity. If you just dump the content written elsewhere by someone else into the game, what are the chances this content will fit thematically? That the main writer won't spend a comparable amount of time as Dr. Frankenstein, editing all these bits and pieces into something which may live? I doubt many of his supporters and/or ordinary fans would like to see an incoherent mess of a game written by 3/4/5 different people for the only reason of stable updates with tons of content. Freelancing may solve problems, but it's no magic wand, not to mention it costs. Whether such costs are acceptable are a question for the creator, which you can ask if you wish.