My goal for brewing is usually 1 or 2 fermenting or dry hopping, 2 kegged and carbing and 3 on tap. I'm sure I drink more than the average guy, having a beer or two a couple of nights during the week, then quite a few more over the weekend, depending on what I'm doing. I don't drink to intoxication usually, it's just a matter of working around the house, drink a beer, work some more, drink a beer. On the weeknights when I drink, it's usually beer with dinner then that's it. So none the less, I myself put a healthy amount of beer down. When you add it up over a month, a 5 gallon keg really isn't that much beer.
The real strain on the pipeline comes though, when you invite even 3 or 4 more people over for a day of watching sports or a night of playing cards. You start hitting that 6-8 beer/person range, then realize you are pouring at least 16 oz. not 12, depending on the glass, and it's amazing how fast the beer goes.
Basically, since the new year I've only brewed twice, because it got flat out too cold and then having people over for the holidays, the pipeline has shrunk considerably. I've found that not only am I a beer drinker and brewer, but I'm also a beer hoarder. If I don't have a bunch of beer sitting around waiting to go on tap, I get a little uneasy and get the urge to brew again. Then, when I have plenty of beer on hand, I keep sharing it with friends. It's an endless loop that I'm glad I'm caught up in.