I'm in my early thirties, and I'd say only in the last 5 years or so have my thoughts on life been relevant. My diaries from prior are much more simple minded, so not so beneficial for me, but the more recent stuff is. Or, I guess seeing growth always is beneficial. Yes, I do think getting the thoughts on paper/screen is very important. Has a way of clarifying those thoughts so that they are more permanent.

Steemit is an interactive diary for me. I like it when I hear of people using it in the way you are. It's more than a ploy for income.