That's a bit of an unsubstantiated and far-reaching statement.
Why not? People get surgery literally for appearance sake only. A great deal of orthopedic treatments are for convenience and productivity only. You can make this argument for just about any elective procedure. Yes, some people have body dysmorphia, but not everyone that desires an rhinoplasty is insane.
Despite low risk, most cosmetic surgery is riskier than a PEG tube placement. In the US, PEG tubes are routinely placed by non-surgeons (GI docs) and doesn't require general anesthesia.
Current PEG tubes carry risks and day-to-day complications that make this a bad idea for other reasons, but that doesn't make elective procedures fundamentally insane.