Because it is still a conflict of interest, just on a different scale. But its the other side of the fence, which I assume makes it wrong to the anti-vax camp?

Wakefield has been raised above as some kind of anti-vax martyr when he was clearly doing exactly the things most anti-vaxers detest about doctors (variously being funded the medicos): being paid by people with agendas! In addition, Wakefield created an IBS like disorder for which he held the patent for the testing. He stood to personally make MILLIONS of dollars out of it. Of course - that's if his results weren't a figment of his greed-driven imagination.

I'm sorry, but it's the same thing! Conflict of interest on ANY side of the fence will only lead to some seriously dodgy dealings. I have experienced many times in my own field (geology and mining) - none of it is pretty, and it all involves an element of greed & the worst kind of pride.