The first thing I would mention is that most bills, probably I would venture to guess, fall within the exemption Ms. Richard was mentioning. A private interest does not include a matter that is of general application. Most bills are, by definition, of general application, or if not that, the effect a public office holder has as one of the broad class of persons.
Most bills do not specifically target a small group of individuals. They usually deal with rules that are applicable to Canadians at large, to Canada as a whole. The issue does not arise in relation to most bills. It's only when there is obviously a direct personalized consequence that the member must recuse himself or herself from voting, and must make a declaration to that effect in the case of ministers.