I'd like to suggest that instead of building work booths for the poor where machines will pay them money, perhaps the big companies should do everything in their power to make sure these people have a chance at a proper education, so that some day they could have jobs that would give them some dignity. Jobs that the mechanical-turk mega-farmers would wish for their children.
In fact, I think the market for human organs is an interesting analog. Personally, I think that introducing free-market principles into organ exchange would be beneficial to all! The notion of paying someone to agree to donate their organs at the end of their life benefits all of society (see wikipedia article http://en.wikipedia.org/wiki/Organ_donation): LIVES are saved with the greater availability of organs, and the life of the donor is improved with access to money that he/she would otherwise not have. This is not a zero-sum game in which one person must lose for another to win. A principal of economics is that through commerce/trade/exchange we both prosper! Both sides want what the other side is giving them more than what they have to give up. ie the donor wants money more than organs, and the recipient wants organs more than money. Both sides win!
I have absolutely no problem with compensating organ donors for actually helping other humans and improving society through their generous donation.
Likewise, if 2 consenting adults want to engage in a relationship in which 1 works for an agreed upon wage, and the other provides that work, I see no reason to intervene in that arrangement. As long as each party is aware of the risks and the full terms of the deal are openly on the table (ie if doing this work could be deleterious to worker for some reason and that information is not disclosed) then people should be free to engage in their course of business.
The reason they would consider selling a FUTURE interest in their organs is because it would be the best option on the table. Since it's not currently available as an option, they must be choosing considerably worse option now (which is the best currently available option).
How is your alternative more just, more fair, better?
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Imagine YOUR loved one received a liver/heart/kidney in this manner, thereby saving his/her life. And in so doing it DID improve the welfare of someone loved by the donor allowing him/her to get a better education, get better housing, or something else worthwhile.
What is so horrible about that? Your insurance company would cover it and it would make the world a BETTER PLACE for everyone. By the way, the surgeon gets paid a lot of money for a complex procedure like organ transplant; what's wrong with a donor getting a tiny fraction of that for his/her contribution providing the amazing, wonderful gift of life?
EDIT: Though, again, my main complaint isn't about one opinion or another regarding this issue, but about the lack of discussion of what is, in-fact, the real issue here. Instead, I see commenters suggesting ways to deal with vandalism or "crap data". To me it sounds like discussing the (efficient) mechanics of, well, I don't want to give extreme historical analogies here which do not apply, but the point is that people are quick to suggest ways for improving a process before giving serious, and I mean serious, thought to the question of whether this process should exist in the first place, and what could its effect be on the minds and souls of the people its targeting.
I will admit, there are roles for government regulation in the marketplace. I simply do not know enough about the chicken I buy at the grocery to make an informed choice. I appreciate the health inspectors, organic labels, and other regulations that facilitate a free, fair, and efficient marketplace in which I do not need to know the farmer to be confident my chicken will not poison me.
However, I do not think lack of open (and understandable) information is the issue in this particular case.
Regarding your last point, I agree with you. The more interesting aspect here is not the implementation details, but rather the questions you're raising of free enterprise, the freedom to work, and the freedom to engage in free & fair commerce of your choosing.
