I thought that people maybe would not want to eat eggs because it's still exploitative of the hens. After all, they will have been bred specially, over centuries, to maximise egg production at the expense of a longer life. It's quite exhausting laying eggs day in, day out, I should imagine. Not to mention what happens to the hens after they've passed peak laying period (which is about a year or maybe 18 months at a pinch). At that point they get killed anyway. Not to mention the issues of battery hens, which (worldwide, at least, if not in the UK) still account for most egg production.
Being a commercial egg-laying hen is a short and not necessarily a pleasant life, sadly.