I think you're being far to hard on China. You have to realise what $62 will buy in China. This is in a country where even 1/10 the US average wage is considered rich. So, to the average Chinese person $62M is equilivent to $620M to a US person.
This also converts to military issues. The average sodier is paid far less, the cost of materials is far less, the cost therefore of home built tanks and planes is therefore far less. China may be much poorer than the US but it can buy far more the same amount of money and is fast expanding it's economy.
China may therefore not yet be able to match the US in ability to projet force or aid, but it has already matched the US (in fraction of GDP) given in this disaster and will learn from it's inadequecies so that next time it is far better placed to actually project such help.
The US's great weakness here is that it undoes much of the good will it generates through disaster relief by then politicising such relief. Trying to laugh off China's substantial contribution instead of saying well done is just another example of this. China may end up giving less than the US in this disaster but China will end up with the better improved foreign relations, for it gave more of what it had and attached no political strings to it.
Paul.