How many people actually need weather sealing?
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K5, K200 and several film Pentax cameras!

PPG Wedding photography Flickr
Concert photography
Currently on a Pentax hiatus until an FF Pentax is released

But for me, a big part of the usefulness of the weather sealing is that you don't worry about using the camera in places or conditions where it MIGHT (as opposed to definitely WILL) get wet eg standing in the sea, lots of spray, tripod very close to sea level, just above breaking waves etc...
I once did a workshop with a couple of nikon users who wouldn't go anywhere near the waters edge for fear of damaging their beloved...
Best
Bill
BillWardPhotography
One of my K-x's got water damaged after being out in the wet, but the K-5's and K-3 have never suffered. I think it's more important for the camera to be weather-sealed than the lenses; with some simple precautions it is possible to keep the lenses acceptably dry, but I've found that a bit of water on the lenses usually does no harm as long as they are properly dried out afterwards.
Regards
David
Flickr
Nicola's Apartments, Kassiopi, Corfu
Some cameras, some lenses, some bits 'n' bobs

Phil
K-5iiS; K-r; ME Super; ME; DA* 16-50 f2.8; DA 18-135 WR; DA 55-300 WR; HD DA 15mm F4 ED AL Limited; FA 50mm f1.4; A50mm f1.7; DAL 18-55mm; M40mm f2.8; + assorted non-Pentax lenses
My Flikr Page link
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
I need it only occasionally but I always carry at least one WR lens with me, just in case.
K3/K5/10-17fisheye/15mmDA Ltd/18-55WR/55-300DA/100DFAMacroWR/50F1.4M/200F4M/DA*200F2.8/DA*300F4/DA*50-135/DA*60-250/Mitsuki 400F5.6/others.
I had a video camera stop for a while many years ago in Oban due to extremely wet damp weather but have never had anything fail due to rain or damp since.
Best regards
As other people have said
a) its not just the rain protection you benefit from,
and
b) The extra 'peace of mind' WR gives is a tangible benefit
Can't answer the Poll as none of the options is close enough. I can say however that if Pentax didn't offer a WR DSLR at about the £500 mark then I would look elsewhere or not purchase at all.
ChrisA
Member
South West London
Just curious
Edit... doh, I can't seem to edit the typo in my last option. If a passing mod could kindly stick an 'i' before 'rrelevant' I'd be grateful. And perhaps edit this edit out too, many thanks!!
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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