What is evil? I like the AD&D definition - a scale of more and more willing to allow harm to others for your own benefit. Of course, what is seen as harm that matters is the rub.
Would an open organ market save lives - oh, yes, and prohibiting it does cost lives - so one could certainly argue like here that the prohibition is evil.
But allowing such a market will create a society that allows much more willful harm for profit. Right now, organ illegal organ harvesting exists, but is somewhat rare and difficult to make a safe profit from. The legal 'market' is based on donations - so there is no prohibition on the act of getting organs, there's just more people with failing organs than people dying with healthy organs.
The results of allowing an organ market would be an opening bubble resulting in increased harvesting amongst the ethically 'invisible' (poor/isolated), and a greatly increased demand for 'donors' either desperate or false (in order to launder organs). Some of this will be caught, but much of it would become institutionalized.
The endpoint would be a lot of poor people across the world dead and permanently disabled, a lot of wealthy and older people living a few months longer, a relatively few children of the wealthy saved, and a HUGE number of people financially invested in the organ market through their banks and mutual funds.
This last part is the big evil thing - markets always, ALWAYS demand more - more organs, more secrecy, more profitability. They thrive on multiplying evil in terms of harm ('externalities') in order to create better profit ratios.
The whole pattern is just far to evil for me.
I'd suggest putting more money into single-organ cloning (there's been some amazing developments lately), but if there's one thing the market process is HORRIBLE at, it's doing scientific research - it always seems to abandon anything long term, treats it only as marketing, and destroys far too much (to prevent helping 'competitors'.) Taxes, though a limited kind of evil, tend to be much more productive over time for the same result.
Ryan Fenton