>>3335122not that guy, but I carried my 450d into the rain and snow, with an 18-55 IS lens, never suffered because of it.
Weathersealing is really overrated, it's also true that it's overrated until you need it and then it's too late. If you need it you know it, but 99% of us doesn't.
If you're a natgeo kind of photographer where your daily routine takes your gear through all the weather extremes possible in the span of a month, you need it.
If you sometimes take photos in the snow or on the sea and mountains and take good care of your gear, probably you don't.