I have the feeling that I'm shorting myself quite a bit, maybe by $30K or more according to the salaries I researched several years ago for similar roles (full-stack dev minus visual design) in the same town.
My problem is I got comfortable. I get along with the boss and other employees (and one of them has been there almost as long as I have!), and am afforded some perks that are very useful, such as flexible hours, private office, no supervisor (just the boss/owner), etc.
And, due to being "comfortable", I haven't pushed for occasional raises or seriously shopped around for better positions. In fact, I think the only reason I wrote this was for it to act as an attempt to nudge myself away from "comfortable".
TLDR: don't get too comfortable.