Commitment, laziness, distraction, priorities, reward and achievement

I really like the idea of blogging.
Its not people reading what I write, its the personal development facilitated by introspection that appeals to me.

So why do I always forget to do it?

Is it laziness?
Is it a lack of commitment?
Is it distraction?
Is it a lack of time due to other priorities?

I don't think so.

I think its because unlike so many other activities, there is no instantaneous feeling of reward or achievement (spot the Gen-Y, but I'm going to rant anyway)...
I go to work, I complete a piece of work and something happens. Achievement and/or reward.
I go for a run, I'm knackered. Achievement and/or reward.

Just two examples, but everything is about instantaneous fulfillment and it seems that writing to a blog takes a little longer to achieve the fulfillment I am so used to, and subconsciously am wired to require.

Just a thought.