Why do I blog? Blogging is a matter of self-expression, mostly, along with the hope that some reader may be entertained or informed (in that order of difficulty). This is consistent with a model in which the number of posts in my blog appears as an argument in my utility function, alongside consumption of rice, housing services, transport services....
As Becker argued, utility is actually a production process involving commodities purchased in the market, as well as time. Time however is also a factor in producing the income to purchase the market goods. So the choice of time allocation and choice of goods is a compromise between competing ways of generating utility. For example, in deciding to buy a DVD, the biggest factor is time (for the dollar-per-disk variety, cost is rather trivial.)
And similarly for posting in the weblog. It is relatively easy to trace a life history of my schedule over the past couple of years. In general during months where the frequency of posting would be higher, the value of my time for income-generation was rather low (deadlines farther away).
Now is as fairly convoluted an explanation as you can get for a posting hiatus.