And then you realize that the people in that comic were actually men.
You have to love Yuyuko-san and her choice of restaurants. I have to wonder if the person Yuyuko-san is representing is really loaded, or is like me and saves up to treat him/herself every once in a while, and just seems to be a rich person. I'm thinking it's more likely the former than the latter. I always feel like Kogasa-san when I'm going out to eat with friends at conventions. 
Yuyuko probably just saves up money and treats herself to food, instead of spending it on other things. She might be rich, but her saving money for food is more believable.