Rosewind, ""Measles outbreaks in unimmunised people tend to be mild in those who do not have underlying medical conditions"
RW, measles is typically uncomplicated in otherwise healthy people. The majority of people who contract measles survive with no ill effects. This does not mean that measles can't have complications or be deadly for some people. Your quote from an 'anti-vaccination' website does not say otherwise either.
My quote from the WHO points out that if you live in a developing country with low incomes and poor healthcare infrastructure then you are more likely to die from measles. Poor healthcare infrastructure does not just mean unavailability of vaccines, it also means less access to treatment in cases where complications occur. Complications which are more likely in those countries due to things like Vitamin A deficiency. No one has suggested that a life is less valuable because they are immune-compromised. 
RE chickenpox, yes, there is an economic argument to consider. There is also the fact that the CP vaccine will require boosters to continue immunity throughout adulthood. People frequently use Japan as an example of a country where the vaccine protects for 20+ years. However, the vaccine coverage in Japan is low and circulating "wild" CP acts a booster. In countries with widespread coverage (such as the US), 'wild' CP is not circulating as well to boost immunity so they have had to introduce a booster. The CP vaccine is less effective in adults so you could be left vulnerable to the disease as an adult, when you are more likely to suffer complications.
Yes, I'm aware that the flu vaccine is being offered to children in the UK now to 'protect' the elderly (who already have a flu vaccine offered to them and who frequently don't take it up) As I pointed out, the flu vaccine is not particularly effective (