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Yeh, would be nice, I agree but would be very costly to do that.

The type of mining hardware and its power efficiency in each farm and the electricity costs in each farm will no doubt vary so if they have a new farm with much lower costs and better hardware efficiency then they can really only pass those costs along to hashpower that will be mining in that new farm, hence the new lower maintenance fees, and not to all their other farms as they all have their own individual costs.

Anyway am looking forward to seeing what the payouts are gonna be, I know people do reinvest so those that do, the new fee will really help them out as I have worked out that for a GM contract to start paying out negative payouts is around 170 USD with the old fee, but if they add new hashpower at the new rate then this means that Bitcoin has to fall even lower before payouts become negative so anything that can help users from losing their investments because of the price of BTC falling to a certain level is better than not doing anything at all.