"If you buy drinks for her, that indicates that you think she must be a good catch, i.e. she's out of your league" Could you elaborate on why buying a drink fo

"If you buy drinks for her, that indicates that you think she must be a good catch, i.e. she's out of your league" Could you elaborate on why buying a drink for someone indicates that she's out of your league? Is there an alternate approach in a drink-serving setting that would not hint that?