In response to the OP.
Bruce pretty much summed up why we do our blog. First, the new build, kind of a no brainer.
Second, now that we are cruising, it's mainly to keep our friends and family posted on where we are and what we are doing, plus our own record of our activities (so we don't argue later on about what we actually did).
I do think about audience from time to time. It gets complicated when I try to hard to write for a specific audience. You start to think about 'what does the audience(s) want/need to know', and it drags you down paths that you don't really want to travel. For instance, ours is not meant to be a "cruising guide", as we don't try to catalog every bit of information about a trip or a port that any/every cruiser might want or need to know. Instead, it is more about our experiences, and offering a sense of how we roll.
I don't expect anyone to follow the blog religiously (or at all). I do think that it might be an interesting reference for someone who is, for instance, thinking of buying a trawler or an American Tug, or someone thinking about maybe doing a Maine cruise. It might come up in Google searches for topics such as these, and thus specific posts might be of passing interest.
One of my big problems with the whole concept of having people (strangers) 'follow' the blog is that I hop around to completely different topics. Cruising Maine one day, Airstreaming on another day, and Scottish Terriers (or FOOD!) on a third day. Someone interested in trawlers is going to get totally confused, and possibly annoyed, when they start reading about Scottish Terriers.
So in the end, I write about things that matter to us. I hope someone, somewhere, might find some benefit, but in the end I do it for us.