The average cost for a single dimmer is less than $20 so it pays for itself in about 26 months.
FUN facts....The cumulative impact of dimmers can save enough energy each year to light 4.5 million homes in 12 months and installing 1 dimmer in every US home, for instance, in place of a standard light switch would save $816 million in electricity annually and reduce CO2 by 4.3 billion pounds per year. Which is like taking 370,000 cars off the road.
Of course the best part of dimming lights is we all tend to look better in them. :)
So here is my not sooo good attempt at a "before" dimming DR and an "after" dimming DR.
I realize my camera skills suffer in showing this and have to say that dimming in person looks soo much better than on camera, ha!