I used to do it, before I realized that pretty much only other creators were seeing them, because that's mostly who uses the website, and there are no walls on the app.
The thing that really made me stop doing it, though, was when I posted one to another creator's wall, and they responded, "please subscribe to my comic". I don't do sub for sub, and I found this very presumptuous. I didn't sub back, and, unsurprisingly, they unsubbed from my series shortly after. Kind of left a bad taste in my mouth.