I'd thought the intent was probably fairly innocent in the sense that when the government does a bill, the Department of Finance, the Treasury Board, or whomever, are going to have to satisfy the cabinet as to what it will cost. Presumably, it's the kind of information that could be made available to Parliament.
If a private member designs the bill, there isn't anybody around to say, here's what this is going to cost. In that sense, I had interpreted it to be a service to private members and to parliamentarians generally.
Of course, if the parliamentary budget office had doubts about the costing that was attached to a government bill, I believe your legislation gives that officer access to all the data in the department. If there were cause, the office could check it out and perhaps give you a different opinion.
I had assumed that the costing of a private member's bill had an innocent intent.