Agree with you mrcjonesy, driving straight to Mt Kailash in two days is calling for trouble and is bound to lead quite a few people straight to hospital (which won't have gamow bags anyway...). And it would definitely be a pity to miss all the sightseings on the way (Gyantse, Shigatse etc).
The adventure thing is of course a commercial argument for agencies. Has to be ! That's how Tibet is sold by agencies. Now the Chinese are building roads everywhere, they want to develop mass tourism. Adventure travel for the masses ? Hum, sounds a bit contradictory to me, but I'm pretty sure it'll work. People like the concept of adventure, it is exiting yet most aren't ready to put up with the downsides (like delayed or uncomfortable transports, rundown accomodation, lack of a shower etc).
However the Chinese spoil the area with roads and hotels, the scenery will remain awesome. But it may not be so enjoyable... Wonder what the Tibetans will think/say when they start building a gondola to the top of the mountain as they were planning for Chenresig (Yading) !
@ Stephanie : one thing to keep in mind is that July isn't the best time to visit Mount Kailash as the monsoon affects the border area with Nepal so expect clouds and maybe some rain.
@ batucitrine : listening to what locals say is usually sound. I live in the mountain and every year people die because they embark unprepared in an environment they don't know anything about. Don't know about avalanche risks in the area, but that's usually the biggest risk after heavy snowfalls. There's nothing even an experienced mountain person can do against that except stay away ! By the way, did your guide let you walk up the pass on your own or did he accompany you up there ?