They post links to rapidshare or others. Two strategies are more effective against this:

1. Vendors should report the DMCA and copyright infringement to their domain name registrar, that is probably the one who also hosts their website pages. After some research I got it:

Registrar: WILD WEST DOMAINS, INC.
Whois Server: whois.wildwestdomains.com
Referral URL: http://www.wildwestdomains.com

If Wild West Domains receives enough requests, they may just suspend their account, delete their site and cancel their domain name. This will put an end to TopGFX and force them to retreat or start again.

2) Renderosity can take them to the court and vendors can act as witnesses.

More info about TopGFX hosts and owner: http://www.who.is/whois/topgfx.com/

Wild West Domain copyright abuse page: http://www.wildwestdomains.com/gdshop/legal_agreements/show_doc.asp?prog_id=wildwestdomains&pageid=TRADMARK_COPY

Email for copyright infringement: copyrightclaims@wildwestdomains.com

Let's fight them.