I had the same problem too in the past.
I registered with them, added a few names. I haven't even change the DNS for the domains and the next day I wake up in the morning with my account innactive.
DH is famous for this particular problem and I dont recomend them to people with hundreds of domains especially if they have to change the DNS to domainhop.
One day you might wake up and find your account innactive and not paying you for your past traffic. And think about the trouble of changing hundreds of dns or redirecting those domains, categorizing it and optimizing it.
Anyway, I have a friend with similar problem. He registered for domainhop and added his names for several days. He find it to be quite good as he like the real time stats.
He asked his brother to register DH too.
Both of them were at DH for 2 days then both turn innactive.
DH better do something about this or they're gona lose more people.
PS. After they turn me innactive, i ask them why, and they give me the dumbest answer. They told me I have too much non-us traffic. If that is the case, why did they approve those domains in the first place?
And the bottom line is I'm never gona use domainhop ever again.