I've been with AFD for almost a month now. So far I have seen an increase of about 400% in impressions and about 50% in my earnings for the domains I moved there. (close to 200) Previously I was parked at GoDaddy because of the discount domainer club. For me GoDaddy wasn't very effective but there were a couple names I moved back that did perform better with GD. Overall, AFD has been better, but nothing close to great.
AFD needs a lot of work for it to be a good source for parking. There is little to no real tracking, no ability to post "for sale", and minimal customization.
The conspiracy theories are out there and are possible, but for now I am giving them the benefit of the doubt.
All that being said I think it all depends on your domains. Some perform better with different companies. You have to do some trial and error to find which is best for yours.
Good Luck,
Markus