it all depends on what you think the extra cost is buying you, really, doesn't it?
It isn't for the peace and quiet - most businessmen make as much noise as dd1, since the noise she makes is, err, having a conversation
. same for dd2.
It is for the extra space, the extra amenities, better food, more choice of inflight entertainment, more comfortable seats etc. all these are there, whether you are a businessman or a 6 year old child.
We travel business/first so that we do have more space - dietary issues mean we often have to take dd1's meals with us, and for a longhaul flight this is quit a lot of different meals/foods - space to be able to get that all prepared is what we need. as well as space for dd1 to sit on my lap, which she still does a lot, and space to ensure she is not accidentally inconveniencing other passengers when she gets up to go to the toilet etc - children are not well tolerated in any class, imo, and an accidental jogging of a seat in economy is more likely to happen than in business/first.
the argument that an under 2 is not paying for a seat therefore shoudl not be there is ridiculous - said under 2 does not have a seat, and is sitting with another traveller who has paid.
of course malaysia airlines are well within their rights to impose whatever restrictions they like, but it is sad when hey have to take measures like this.
there is no reason for children to be badly behaved on flights, and there is no reason for people in general to assume form the off that children will shriek, run around and create havoc. it is sad that so many people see children merely as an inconvenience and a nuisance.