Santosh: Actually the bus service is actaully EXTREMELY popular! Seats get filled up 2 monhs in advance! It more comfortable than rail at a similar price and unlike the Samjhauta Express takes passengers straight to Lahore. The train service needs a break at Atari on the border.
Air Travel is only for a select few.
And please mind the "We" bit! The bus servie is a joint venture between Delhi Transport (our good old DTC) and the PTDC on the Pakistan side.