If a motion of non-confidence in the government is introduced by itself with no other provisions, this simplifies the question. Do you have (enough) confidence, or not?
Only if a majority of MPs agree will the government be defeated. In this case, it would require all Liberal, NDP and BQ MPs to agree to defeat the Conservative government. No one of them alone, or even 2 together, could trigger an election.
A simpler question changes the perception when favours and considerations are exchanged as justification for support. Side deals are still possible of course, but more difficult to spin since you have nothing to show for your support - just promises. You really must have confidence in the government if you're going on promises alone, quite literally.