@mukiha is right coz the rise to $140 for oil was rapid but had no staying power [lucky for us] AND the KES/US$ rate was 70/- or so.
Oil prices slipped from $140 to $40 rapidly which led to substantial losses for KK who had already 'bought' pricey fuel.
Plus at the time, the KPC, KPA & KPRL charges were lower than they are at present. Financing costs were also lower [remember the low interest rate environment at the time?]
Greedy when others are fearful. Very fearful when others are greedy - to paraphrase Warren Buffett