Point taken, however, abortionists are relatively rare, hardly the rule.
The arguement that doctors are waiting to rake in bucks offing gramma is, imo, more grasping at straws by opponents than anything else. What prevents doctors from doing that now, personal ethics or the law? I'd say that the law won't stop a determined murderer.
What prevents it now is cost/benefit analysis. The current cost of murdering patients for money is high, and the benefit is relatively low, since we do not have an open market in killing.
By reducing the cost of murder, and assisting in the creation of a market for murder, we will ensure that the intersection of the demand and supply curves will result in a market-clearing price and supply of murder at a far higher level.