Firsty a large proportion and majority are not the same thing and some on the list are far more regular than others

I was mainly thinking in terms of Class B where I would consider a third of the field aren't regular posters with some never posting.
I agree the Majority off DD riders have posted on the board, but take this thread for example over 100 posts so far of which 12 or so current DD riders have had a input and a few Ex DD riders, so about 1/3 the DD field.
If anybody is thinking of entering DD in 2007 it may be worth seeking out one of the DD regulars that doesn't post here and ask their opinion it may help you make the decision to join in.
Loz as far as upgrades go
take the items I listed.
Discs ---- have to be Ducati OE parts so little choice there
Shock --- Budget upgrade is a SSie one and at the other end of the scale there are the Ohlins, WPs, Penskes, Nitrons etc
Master-cylinders--- Budget is a 916 item or GSXR (in Zimbos case), top end is a AP Radial and just down on that a Brembo Radial.
Some people have even splashed out on a Billet Brembo Caliper, but this can often be offset by not upgrading to twin discs