Here is what Sony says about A99 weather sealing

The problem in America is that if a wheather/water-proof camera fails due to the conditions, the photographer sues Sony. Resulting in that Sony pays for a new camera, lost of income, penalty for false advertisment, compensation for personal grief and the photographers lawyers who magically inflate their true costs by an exceptional large number. Meanwhile in the normal world, Sony probably would just need to replace the camera.

--
http://frenske.zenfolio.com