I'd be curious to see how many people who have a tough-book (or similar) PC really only use it in the cab of their vehicle or in camp where its relatively easy to keep a standard laptop clean and dry. I'm guessing its more than a few. I think we'd all be surprised by how many researchers/ rangers/ field scientists etc. get away with a standard laptop in some very inhospitable conditions.
Who needs to use their laptop in the rain on a camping trip? Or walk around with it on the trail as a GPS? If you want a tough-book because their rugged and cool, get a tough-book. I have no right to tell people not to get toys just cause they like them. If I did that I wouldn't have half the stuff I camp with. We all get the 'best' sometimes not because we need it but because... well its the best.
Don't know if your post was directed towards mine, but I would like to clear a few things up. When I said that I used mine for all things and as a GPS, I was talking in-car. Toughbooks are way too heavy for use as a hiking GPS. I wouldn't even consider it because of weight and impracticality. As far as using it in the field or in bad conditions, I see that regularly with my work. We've been issued Toughbooks in the past because everything else would break (we've even broken our fare share of Toughbooks to be honest). Regardless of how "inhospitable" the terrian/weather/location is, a Toughbook is a great laptop to have for anyone that spends time outdoors.