Thats exactly right, one of the things I read about... this is from homebrewtalk...
125' of 1/4" SS line is about 163.26 ounces of beer on ice at any given time, or 13 12oz beers.
50' of 1/4" SS line is about 65.3 ounces of beer on ice at any given time, or 5.4 12oz beers.
25' of 1/4" SS line is about 58.93 ounces of beer on ice at any given time, or 2.72 12oz beers.
Not sure if the numbers are accurate but yeah the coil itself holds a lot of beer. Im gonna have to do some experimenting to get the beer pouring good!