@ZdrytchX
She's stopped doing that somewhat, now that she has a fulltime career.
That being said, it never would've created a problem if she hadn't entered the bar in the early chapters and a drunk customer thought her to be working there and then she just started working there. And that never would've happened if not for Hina, because Nitta wanted to get with Utako, but Hina spending time with him made Utako and all the other ladies think he wasn't going to play around anymore. And if he hadn't wanted to do that, he wouldn't have ignored Hina, which would've lead to Hina & Hitomi getting into the bar.
Basically, the first major reason is Hina, then Nitta, then Utako.