There are all sorts of variables at play here - the ambient temperature around the fridge, how many times you open/close the fridge door, the volume of air vs. thermal mass of cold kegs in the fridge at any given time, adding in a keg of warm beer, etc. Every one of those factors would make the fridge need to turn on/off at different rates depending on what's going on. I suppose with careful data logging, you could develop a system to account for all the variables (for example, perhaps you could implement a pattern in which the fridge cycles on more often for the first 24 hours after adding a warm keg). in the long run those factors would more or less even out, but in the short term you'd risk either frozen kegs or slightly warm beer every now and then.
"let me be the first to welcome our new insectile overlords"
On deck: Breakfast stout
Secondary: American Pale Ale
Kegged: Imperial red ale, Breakfast stout, Chipotle Irish red ale, Biermuncher's C3C cream ale