Late last year, I signed up with Bodis. I also tried Afternic and Sedo (had been on Sedo and Afternic for awhile).
I found Bodis UX the easiest to understand. On Bodis, I was able to earn a few pennies. In years on Sedo and Afternic, I earned nothing. Note that this is not an earnings comparison between these three companies: the domains were different.
When I was getting set up on Bodis, I needed Support. They were helpful and responsive.
Domain Parking was not profitable for me. Some might say the uploaded portfolio does not have much type-in traffic. I would agree. What I was able to learn from the Bodis interface was which domains received any traffic at all.