I used to brew once or twice a month, depending on my schedule and rotating fermenters and such.
But, I formed a partnership with a good friend of mine, and we have been brewing like crazy, spending all our money on this endeavour. We are doing this to prepare for opening up a brewery and starting a career. So, we brew at least twice a week, and are bottling about once a week usually 30 gallons of beer each bottling session. Recently, we have just upgraded to Sankey kegging (all kegs acquired legitimately!). We throw parties to pass around our beers and to get our name out. We brew 11-12 gallon batches.
So far this year, got around 15 batches under the belt.