If you factor in the number of hours taken to build a hybrid then the £ saving is obviously there but not everyone has the time, facilities or know how to do it. If the alternative was to use a mechanic then you would be looking at 3K.
Buying a race bike restricts the rider to only being able to track it.
Have a used 6R and the decision was not totally logical but why should it be. There is the bling and exclusivity arguement, the feeling of having one, last 916 series to win the WSB championship,bla, bla.
However compared to the 6S I had the differences are substantial. Gear box is much more slick and precise, power deliver straight and faultless, weight (13kgs) is less and this can be felt. Far better P4 brakes. The 6R cost the same 2 years later as the 6S new, if you are prepared to wait. A new 8S cost 2K more. Feel sorry for those that bought them new though.
Whether it is faster on the track remains to be seen, roll on 2005 season.
