My Opinion,
If a site requires registration to d/l items then so be it.
I agree haukdottir in that reliable hosting and posting of freebies does cost money and time for very little, if any, thanks, however it is a good feeling to give something back to the community instead of just taking all the time.
I don't have a problem registering and usually it it has lead to a lot better Poser/Art exprience as when Registering with Renderosity.
Richard