I'm a longtime lurker, first time poster - this thread was right up my ally!
I started a blog with my wife as a way to hold ourselves accountable - we made some big changes in our lives (less instead of more, frugal instead of extravagant, healthy eating instead of anything goes, etc.) and by having our blog, we're forced to continually come up with new content - whether that's a frugal activity, a healthy meal, cost cutting, whatever - we have to continuously come up with content, which in turn means we're continually following the path of the changes we've made. It keeps us honest and holds us to the choices and changes we've made.
By having our own blog, we've also learned a whole load of new skills - blogging in and of itself, HTML/CSS, photography, social media 'marketing' - it also allows us to continue to improve in skills we already had - woodworking, crafts, and cooking.
It's also incredibly easy to get into a 'rut' in life where your days/weeks/months tend to follow the same path day/week/month in and day/week/month out. By blogging, we always on the lookout for new content - what could we do/try/make today that we could share on the blog? What is out there already that we could modify to fit our lifestyle? Things like that always keep us fresh.
Lastly - we enjoy it. Whether we have anyone reading or not, it's something we enjoy doing. We'd much rather have readers (and I'd love for it to someday generate an income - if only to pay the light bill each month!) as the conversation aspect is much more enjoyable than talking into an abyss, but whether anyone is reading or not, it's something we'll continue to do.
We're still working out the kinks - how often to post, how to generate more readership, how to monetize, etc. but it's been a great experience so far!
Any comments/critiques of the site would be wonderful as well - or if you'd just like to read an article, that would make my day too!
www.living-simply.comAs an aside - NWEdible - you're site (and more importantly your back yard garden oasis!) is a HUGE favorite of mine - it's incredible!