Only valid for active forum users. Active means at least 30 postings within the last 30 days (no spam postings). This will automatically being checked at www.starbike.com shopping basket so make sure that you are logged in at the WW board! If there does not appear a WW discount position when you check out you do not have enough postings!
It depends which terrain you ride. I live in The Netherlands and I already ride 8000km with the wheels and till 7000 they were black. In those 7000km I did 1000km hill rides in Belgium