The primary reason I started making comics was to force myself to produce art on a regular basis. I obsess over every detail of my traditional art and I'd typically get stuck on a single piece for months. Then I'd feel like shit for not getting anything else done. Enter comics. For me, they're not super serious, so they don't need to look perfect. I post twice a week, so it's cool to look back and see how much I've gotten done. Even if my comic style is drastically inferior to my illustration style, progress is progress.
The secondary reason is because I have so many little ideas in my head that won't go away until I spew them out in a strip. My imagination is always throwing random stuff at me all day, and comics are a good outlet. I love reading comics, so it's awesome to create stuff that other people potentially love as well. I would make them either way, but it's a major bonus when people look at them and think they're funny and relatable, or weird and cool.