Infrastructure Minister Michelle Haywood says she doesn't know which bus routes are profitable because Bus Vannin doesn't collect the data.
She faced questions in the House of Keys this week from Arbory, Castletown and Malew MHK Tim Glover.
Dr Haywood said as a whole, the taxpayer subsidises buses to the tune of £7 million a year.
But she said public transport on the Island is run for the good of the community rather than to make money:
Repairs on Peel Power Station to get underway
Manx Care doctor survey to be discussed by Tynwald
Weather warning for snow tonight
MHK queries safety at primary school in Ballabeg
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night