As a short term budgeting measure or a long term practice? That is the question, it also depends where you favor placing your savings. I have heard of farmers having done this long term and have some 'ahem' interesting weed problems.
Financially the problem for me is this, I can add up $300 per ha of variable costs such as chemical, fertilizer and fuel. My budget shows me that my overall costs are in the region of $600 made up of the rest; payments, wages, repairs etc. I budget around $70 for chemical so although it makes up a sizable portion of the variable cutting rates by ~10% or so won't make a big dent in my overall cost structure. I think if you are looking for saving you should be examining the areas that provide the least return and are top heavy in what they provide for you.
Don't get big or get out get good at it or get out. If your business is stretched financially you are probably better off doing less hectares well than doing lots poorly. You will make more money in the long run which is the aim of the game, but of course you won't have 'cough cough' bragging rites.