Agreed. You can get a keg to last about 6 months as long as the CO2 holds up and you keep it cold. Mine goes for months during the summer when I don't have poker games going on with no problems.As long as your system is in good working order, (temp, co2 pressure etc) the keg will last months.
The keg in my picture above took me almost 4 months to drink and tasted the same as the day I tapped it.
I have however switched to the 20l smaller kegs. I can fit two of those in my fridge and that way I never run out