Because we feel it's important.
And because our twitter friend @jamiesport has been working so damned hard for the DEC this last week that we want to show our support for his work.
Please give what you can, even if it's only a couple of quid. Or text "GIVE" to 70077 if you're in the UK, to give a fiver to the DEC (it's added to your phone bill). If you're in the US, text "HAITI" to 90999 to charge $10 to your phone bill for the Red Cross.
There is also this option - Non-Believers Giving Aid - which uses paypal. And obviously doesn't include any religiously-affiliated organisations.