Ryan,
We have not looked so much at cost savings, but the quality of cut and the aesthetics are much better under normal conditions. Under wet conditions I know there has to be significant savings. The way we apply our growth regulators, we stagger out the applications so there are times when the growth regulator may run out on a few holes, and when we have wet periods we end up double/triple cutting and blowing the fairways that are not regulated, while the ones that are a single cut usually suffices.
I would suggest trying a third of your fairways and try to figure out the savings, and as Keith says try to factor in wear and tear/fuel as well as labor costs.
Here is a link to a good article that contained a PGR cot savings calculator (but the tool link seems to be broken) but the article is worth reading.
http://www.golfcourseindustry.com/artic ... e-to-stay/Billy