I probably average a little more than a pint a day (some days none, some days several) - so I can't drink all of what I brew. But, I have help. Depending on what I have on tap, my wife is usually good for a few pints a week - and her palate is broadening, so she's helping more. My son (23) lives with us, and his girlfriend is often around - so they help, too. His girlfriend is a total hophead, and really likes IPAs, IIPAs, etc. And, in the summer, my daughter (21) is home from college and does her best to pitch in, too.
We usually have two or three gatherings over the year, each of which is good for blowing a keg or two. Last July 4th some family came over and 16 of us drank a whole keg of Cream Ale over the day. We knocked off another keg of Pale Ale on Labor Day. And, I have an OktoBEERfest! each year that I brew four German styles for (20 gallons) - and we go through most of that in a day since we have 40-50 guests.
With the help and gatherings, we go through enough beer that I brew around 20-25 batches a year, including a few 10-gallon batches. Like others, I enjoy the process, the tinkering, and learning about and brewing different styles a lot. It's to the point that my wife asks me what brewing plans I have just about every week. There's always something to do - brew, rack, build equipment, shop for ingredients, etc.