In my experience, LLMs tend to be pretty good as long as you know the topic well and are capable of judging the quality of its output. They will always spit out a mix of good data with trash. So if you're set on using an LLM for this, you'll either need to learn to cook without a recipe or accept whatever level of trash you might get from it.
For things like cook time, it's never going to be exactly right regardless of whether you get the numbers from an LLM or from a reputable cookbook. Things will vary depending on the temperature of your stovetop, size of the cut, freshness of the ingredients, the atmospheric pressure, etc. The only way to get this right is practice.
Otherwise, if this is working out for you, then I see no reason to change anything. If you have specific problems though, we might be able to give some more helpful tips.
But resources aren't being distributed fairly.
That's a rather arbitrary rule. You would still need a bunch of stipulations on top of that to make sure it's fair to the renter.
Assuming you do have all the right rules in place, what makes this setup more desirable than simply renting at cost?
Just so we're on the same page, we're still talking about OP's question, right? My definition of parasitic requires being a net negative to the "host". The threshold between parasitic and non-parasitic is at net neutral for both parties, and we're discussing where that line is.