Sure it's nothing to do with money as such. It's about prestige, small bit of Insta Fame. Same with Jessica O Mahony, another cork wan who doesn't need any money, yet is fecking showing us coffee table books days after giving birth. So strange.
Also Cliona seems to be friends with Shabby. Or at least, they were in school together, Cliona gets her hair done in Kopper, they occasionally tag each other or do lives. Other than using each other for the Gram, I doubt they're proper friends. Total Mean Girl vibes from both of them.
Cliona used to get her hair done by Martina in Kopper, seemed to love her, but then Martina abruptly left Kopper. So instead of Cliona following Martina to her new salon, she stayed with Kopper, which I always thought was kinda telling. If I have a hairdresser I love, I'd follow them. Cliona stayed with Kopper as it is better for the Gram, and didn't want to piss Shabby off.