Figured this out today...

A Keg of Summit at Surdyks (big liquor store in Minneapolis) is 16 gallons.
Each gallon is 128 ounces.
That's a total of 2,048 ounces per Keg.
A six pack has 72 ounces.
That's 28.4 (we'll call it 29) six packs in a keg.

The Summit keg costs $125.
An average Summit six pack costs $7.50
29 Summit six packs would be a total of $217.50
Thus, you would save $92.50 each keg.

The average price of a kegerator that holds a half-barrel keg (16 gallons) is $700.
A Summit Tap handle is $28.00, making the ensemble a total of $728.

According to my year of beer, I average about 90 six packs a year, meaning I alone would go through 3 kegs a year. Since I'd be sure to have people over, let's double that to be 6 kegs a year.
6 kegs at a savings of $92.50 each is a total savings of $555 a year.

That means by mid-way through my second year of Kegerator ownership, my beer savings would have paid for the Kegertor.

I want one.