Yeah, those douche bags probably renew them because they think they're still going to make money. If you have a legitimate claim to the domain (like it is your name) and somebody is parked on it in bad faith, you can file a complaint with ICANN and possibly have it transferred to you. See
ICANN | Domain Name Dispute Resolution Policies If that doesn't work I don't think it would be entirely immoral to call up their registrar and do a little social engineering to take it over. I also advise against paying any money to GoDaddy, who will shut down your domain before doing as much as consulting you if you publish anything they decide don't like.