I mean, dont get me wrong ...
I dont doubt for a second that Illithids are smart enough to realize that this potential meal brought them proposition, that would lead to much more meal and other potential resources and stuff ... hells, even Lizardfolk can understand this concept.

What i cant understand is the meal point of wiev ... why would anyone even propose such thing?
What i can imagine, and it may potentialy be though as some very twisted kind of trade ... is paying them a tribute ... you know, something like: "We get you 100 slaves per year and you dont enslave us, ok?"
That would make sense to me.
Now, when i think about it, it seems that i located my problem with the idea.

Bcs, quite honestly ... Drows, Duergars, and Illithids ... have same mentality as common murderhobbo, in my mind. You can offer them gold for not killing you ... and thats a good deal. But they can just aswell kill you and take the gold, so why would they accept your offer?