yes the charge a yearly fee, I think. Or maybe it is a one-time charge. I can;t remember.
I have to say, I have only tried 2 parking services so far. Sedo and Fabulous. I make about 1/4 the money with Fabulous that I made at SEDO. No, I am not using Fabulous 4.0, just the regular parking. Not sure I even want to bother to be honest with you. I am very disappointed in the click money I make there. they seem to constantly re-categorize my domains. For instace, if I have a domain with "merchant account" in the domain name, they will put it in "finance" when a merchant account is more specifically to do with the Credit Card category, IMO, than with Finance. Finance is too general. CC also brings a higher click revenue as well. SO maybe that is the reason. hmmm.
I will be moving most of my domains over to Afternic shortly to check it out. After that, it's back to sedo most likely.