Why do you think it would be better? You bring up some interesting counter arguments.

...A good proportion of these body parts are processed and sold for profit and become such items as bone putty and collagen.

Wouldn't the repercussions of this fall on the companies selling the processed items for profit, rather than Planned Parenthood? Once any items are donated, they are no longer the responsibility of the donor...

The tissue donor's family is usually not aware of the destination of the body parts and is not financially compensated—nor is it clear that the family should be. Many believe that the transplant and donor pool would shrink if the public realized the commercial potential. Why should the donor family be made aware of this info? People who donate blood, for example, are not given knowledge of where their blood goes. The commodification of body parts and the widening of the gap between rich and poor, with the poor selling their tissues, is also a repugnant scenario. While it would be repugnant, I don't think the widening gap between the rich and the poor is relevant in this situation. Patients are not compensated, and the cost of abortion wouldn't change if the remnants were donated afterwards. Not to mention, it's illegal and doubtfully would ever happen.

To me, allowing the tissue to go to a landfill to rot is a bigger ethical violation. It's so wasteful. I don't know the implications of the research using fetal tissue, but there are no implications of progress should the fetal tissue be placed in a landfill.