Originally Posted by Saturn Dreams
I suppose it depends on what your definition of "common" and "frequent" is. It's definitely not something I would hear on a regular basis living in Kobe, which is right beside Osaka, home of Kansai-ben. I can't remember the last time anyone used "Okini", except when in Kyoto. It would also depend on the company around you. If they are the type to use that language you may think it's "common" because it's used within your group, but not so among the general populace.
I think Kobe (and Hyogo in general) is probably one of those places in Kansai where ookini
is on the way out. I don't think I've heard it used there either. Like most dialect it's very much a YMMV issue (like you say, it's mostly about where and with who you hang out), but the one situation in which you hear it most frequently, IME, is when someone gives you back your change.
To sort of bring this back on topic, the point is that what constitutes an appropriate response to something almost entirely depends on context. Where you are, who you are, who the other person is, what is happening...