Afraid I don't agree with this either. Err sorry
A modern chain fitted to the 650s and ridden normally should last at least 24'000mls
without an oiler fitted.
With an oiler fitted and working the 650 chain should last about 35'000mls
I had an oiler on my GSXR1100 and didn't need to adjust the chain at all in over 5000mls.
SWMBO's 650 was bought with 8'000mls on the clock, so it's reasonable to assume it still had the original chain (no oiler) I had to be replace it before the bike reached 10'000mls.
The DID replacement has now done over 10'000mls and been adjusted only once or twice (still no oiler fitted).
Speaks for it's self really
Val.