Hi Everyone,
My views on upgrades are:
1. There is nothing wrong with upgrading people into an empty F/J class cabin, even if Y is not overbooked. Would people from F/J be pissed off ? Why would they ? By paying premium prices, they are guaranteed a F/J seat, earn more miles, and in some airlines (like SIA PPS) be given special recognition.
2. There is nothing wrong with asking for upgrade. In a restaurant, I can ask the manager to give me complimentary dessert/wine. It is up to the manager to reject such requests.