the service cost is nothing between the bikes.
Mine costs on average R200 to service, which by the way is 1200k intervals but as it is so cheap I do mine at every 6000k! In the long run it will add up to quite a significant difference. As to your claim that a KLR only lasts 50,000k, all I can say is pull the other one! 
Yes, and your bike use more fuel, and need frame bolt up grades and Doohickies and new seats, and screens and the carb ice up on it's way up Sani, and the wheel bearings only last 10000km when doing water crossing, and drinks oil in litres after the first 1000km and........

But that it is cheaper to maintain is all relative, the GS might be slightly more, and I mean 100bucks or so, not thousands or even hundreds, but nothing to stop you considering owning one because of service cost.
Okay they only last about 51000km

btw way I had both and lived with both for a year, the KLR is getting old in the tooth but it's no Dakar or even a GS, it is cheap though and that helps a lot, the one had to go, still a bit sad it was the KLR.
