Big greens require more resources for sure, but they also spread out the wear and tear, leading to less maintenance dollars per square foot. Fertility required correlates to the rate of recovery required.
Similarly, big greens can usually be triplexed and boom sprayed, while a small green with quick fall offs into bunkers and such might have to be walk mowed and spray hawked, which will lead to increased labor expense.
So in a sense, big greens might actually save labor, and offset the increased material requirements.
That's one of those things where you have to define "big" for me. I have run the math, and on a single "tilted plane" green, you can get 21 cup spaces in a bit over 4,000 SF. Add a ridge to break drainage, and you might get a minimum of 5750 or so. I often try to design a variety of green sizes from 4 to 8K. Mostly supers look at me askance for any green over 6500 SF as being maintenance problems. That seems to be the widely accepted industry standard as big enough to spread cup spaces out on a normally contoured green. I start there, and often, budgets drive the average down to 6K.
Given my clients trend closer to the BAM mode, its one reason I don't do many "random contours," a la Maxwell Muffins or Doak Dimples(?) "Coore's Crests(?), or even "Diddel bumps" (a phrase which I presume was attributed to that architect's greens, LOL) I understand their design benefits, but when you take out a 10 foot circle (i.e. 5 foot radius allows raising bump 3-4" at reasonable slope) for the actual dimple, and a 10 foot circle outside that where most supers wouldn't set a pin (knowing golfers would bitch) you end up adding 1250 SF to a green, making that 6500 "ideal size" green 7,750 SF to provide the same cup space. And honestly, whenever I have put a knob in the middle of the green, most retail golfers (as well as better ones) bitch. Their idea, which is hard to argue, is that if they hit a good putt, it ought to have a predictable roll, i.e., a chance to go in, rather than random deflections that might not distinguish a good putt from a bad one.
When trying to save money in construction to make green fees reasonably priced, even 1250SF (at $6-10 per SF) is about $10K you don't really need to spend, i.e., random contours are nice, but are then a nice idea HERE? Very often, the answer is no from an owner predicting they will have a hard time of it, if not now, at some future point when the economy is down, etc.