First Class passengers are often those who do not wish to be ogled, approached or pointed out to all and sundry. They can be pretty confident the other passengers in the cabin will show respect and not infringe on their right to privacy.
A couple of years ago I was bumped up to seat 2A on a QF 747 due to a change in aircraft from 3 to 4 class, and to be honest the business class seat was just as good and the TV screen was better than the tired old First Class equipment.