You worry more about BC's welfare or transport company's profits
? 
A double decker bus cost some $520k (Say SBS takes in 50% double
deck, 50% single decker fleet) if ppl want more double decks... It
will cost them $780m for the double decks, $525m for e single
decks. It cost a total of $1.305bn.
Take 10 yrs to finace them it cost $357,000 a day w/o
considering e loan. It's another some 450,000 commuter's fare
money.
750k + 450k = 1.2m pax.
I still have not counted maintenance cost
n interest yet.
And still need to maintain e fare.