Thanks to Dawn Eden, I read this study which showed that most women who have abortions were using contraception at the time of the unplanned pregnancy.
This clearly demonstrates the economical reasons why Planned Parenthood encourages contraception. By encouraging more women to join the ranks of the hormonally altered, PP increases the pool of people who are more likely to have abortions and generate revenue for PP. Conversely, if PP chose to encourage women to abstain, those women would be statistically less likely to have abortions and therefore decrease revenue for PP.
Gateway drug to abortion is yet another reason to reject contraception, aside from the lethal damage to young babies, the physiological damage to the user, the pschological damage to a relationship, the environmental damage to the world, and the moral damage to your soul.